diff --git a/assets/js/project_details.js b/assets/js/project_details.js
new file mode 100644
index 0000000..2046209
--- /dev/null
+++ b/assets/js/project_details.js
@@ -0,0 +1,76 @@
+
+document.addEventListener('DOMContentLoaded', function () {
+    const overrideBtn = document.getElementById('override-btn');
+
+    if (overrideBtn) {
+        overrideBtn.addEventListener('click', function () {
+            const projectId = this.dataset.projectId;
+            const month = this.dataset.month;
+
+            if (this.textContent.trim() === 'Override') {
+                this.textContent = 'Save';
+                this.classList.remove('btn-warning');
+                this.classList.add('btn-success');
+
+                makeEditable('WIP', month);
+                makeEditable('Opening-Balance', month);
+                makeEditable('Billings', month);
+                makeEditable('Expenses', month);
+
+            } else if (this.textContent.trim() === 'Save') {
+                const wip = document.getElementById(`wip-${month}-input`).value;
+                const openingBalance = document.getElementById(`opening-balance-${month}-input`).value;
+                const billings = document.getElementById(`billings-${month}-input`).value;
+                const expenses = document.getElementById(`expenses-${month}-input`).value;
+
+                const formData = new FormData();
+                formData.append('projectId', projectId);
+                formData.append('month', month);
+                formData.append('wip', wip);
+                formData.append('openingBalance', openingBalance);
+                formData.append('billings', billings);
+                formData.append('expenses', expenses);
+
+                fetch('save_override.php', {
+                    method: 'POST',
+                    body: formData
+                })
+                .then(response => response.json())
+                .then(data => {
+                    if (data.success) {
+                        this.textContent = 'Overridden';
+                        this.classList.remove('btn-success');
+                        this.classList.add('btn-secondary');
+                        this.disabled = true;
+
+                        updateCell('WIP', month, wip);
+                        updateCell('Opening-Balance', month, openingBalance);
+                        updateCell('Billings', month, billings);
+                        updateCell('Expenses', month, expenses);
+                    } else {
+                        alert('Error saving override: ' + data.error);
+                    }
+                })
+                .catch(error => {
+                    console.error('Error:', error);
+                    alert('An unexpected error occurred.');
+                });
+            }
+        });
+    }
+
+    function makeEditable(metric, month) {
+        const cell = document.getElementById(`${metric.toLowerCase().replace(/\s/g, '-')}-${month}`);
+        if (cell) {
+            const value = cell.textContent.replace(/€/g, '').replace(/,/g, '');
+            cell.innerHTML = `<input type="number" id="${metric.toLowerCase().replace(/\s/g, '-')}-${month}-input" class="form-control" value="${value}">`;
+        }
+    }
+
+    function updateCell(metric, month, value) {
+        const cell = document.getElementById(`${metric.toLowerCase().replace(/\s/g, '-')}-${month}`);
+        if (cell) {
+            cell.innerHTML = `€${parseFloat(value).toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
+        }
+    }
+});
diff --git a/db/migrations/005_create_project_finance_monthly_table.sql b/db/migrations/005_create_project_finance_monthly_table.sql
index e0d9ee7..10ea925 100644
--- a/db/migrations/005_create_project_finance_monthly_table.sql
+++ b/db/migrations/005_create_project_finance_monthly_table.sql
@@ -3,7 +3,6 @@ CREATE TABLE IF NOT EXISTS `projectFinanceMonthly` (
     `projectId` INT NOT NULL,
     `metricName` VARCHAR(255) NOT NULL,
     `month` DATE NOT NULL,
-    `amount` DECIMAL(15, 2) NOT NULL,
     `createdAt` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     `updatedAt` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     FOREIGN KEY (`projectId`) REFERENCES `projects`(`id`) ON DELETE CASCADE,
diff --git a/db/migrations/009_add_value_and_overridden_to_project_finance_monthly.sql b/db/migrations/009_add_value_and_overridden_to_project_finance_monthly.sql
new file mode 100644
index 0000000..2d86e84
--- /dev/null
+++ b/db/migrations/009_add_value_and_overridden_to_project_finance_monthly.sql
@@ -0,0 +1,4 @@
+
+ALTER TABLE `projectFinanceMonthly`
+ADD COLUMN `value` DECIMAL(15, 2) NOT NULL DEFAULT 0.00,
+ADD COLUMN `is_overridden` BOOLEAN NOT NULL DEFAULT FALSE;
diff --git a/db/migrations/010_fix_project_finance_monthly_table.sql b/db/migrations/010_fix_project_finance_monthly_table.sql
new file mode 100644
index 0000000..2918ad7
--- /dev/null
+++ b/db/migrations/010_fix_project_finance_monthly_table.sql
@@ -0,0 +1,3 @@
+ALTER TABLE `projectFinanceMonthly` ADD COLUMN `metricName` VARCHAR(255) NOT NULL AFTER `projectId`;
+ALTER TABLE `projectFinanceMonthly` ADD COLUMN `value` DECIMAL(15, 2) NOT NULL DEFAULT 0.00;
+ALTER TABLE `projectFinanceMonthly` ADD COLUMN `is_overridden` BOOLEAN NOT NULL DEFAULT FALSE;
\ No newline at end of file
diff --git a/project_details.php b/project_details.php
index 08fc482..3249c0e 100644
--- a/project_details.php
+++ b/project_details.php
@@ -236,17 +236,35 @@ if (!$project) {
                             <thead>
                                 <tr class="text-center">
                                     <th class="bg-body-tertiary" style="min-width: 150px;">Metric</th>
-                                    <?php foreach ($months as $month): ?>
-                                        <th><?php echo date('M Y', strtotime($month)); ?></th>
-                                    <?php endforeach; ?>
+                                    <?php 
+                                    $is_first_month = true;
+                                    foreach ($months as $month): ?>
+                                        <th>
+                                            <?php echo date('M Y', strtotime($month)); ?>
+                                            <?php if ($is_first_month): ?>
+                                                <button id="override-btn" class="btn btn-warning btn-sm mt-1" data-project-id="<?php echo $project_id; ?>" data-month="<?php echo $month; ?>">Override</button>
+                                            <?php endif; ?>
+                                        </th>
+                                    <?php 
+                                        $is_first_month = false;
+                                    endforeach; ?>
                                 </tr>
                             </thead>
                             <tbody>
-                                <?php foreach ($metrics as $metric): ?>
+                                <?php 
+                                $editable_metrics = ['WIP', 'Opening Balance', 'Billings', 'Expenses'];
+                                foreach ($metrics as $metric): ?>
                                 <tr>
                                     <td class="fw-bold bg-body-tertiary"><?php echo $metric; ?></td>
-                                    <?php foreach ($months as $month): ?>
-                                        <td class="text-end">
+                                    <?php 
+                                    $is_first_month_for_body = true;
+                                    foreach ($months as $month): 
+                                        $cell_id = '';
+                                        if ($is_first_month_for_body && in_array($metric, $editable_metrics)) {
+                                            $cell_id = 'id="' . str_replace(' ', '-', strtolower($metric)) . '-' . $month . '"';
+                                        }
+                                    ?>
+                                        <td class="text-end" <?php echo $cell_id; ?>>
                                             <?php 
                                                 if ($metric === 'Margin') {
                                                     echo number_format(($financial_data[$metric][$month] ?? 0) * 100, 2) . '%';
@@ -255,7 +273,9 @@ if (!$project) {
                                                 }
                                             ?>
                                         </td>
-                                    <?php endforeach; ?>
+                                    <?php 
+                                        $is_first_month_for_body = false;
+                                    endforeach; ?>
                                 </tr>
                                 <?php endforeach; ?>
                             </tbody>
@@ -268,5 +288,6 @@ if (!$project) {
     </div>
 
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
+<script src="assets/js/project_details.js?v=<?php echo time(); ?>"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/save_override.php b/save_override.php
new file mode 100644
index 0000000..3cb3c72
--- /dev/null
+++ b/save_override.php
@@ -0,0 +1,49 @@
+<?php
+require_once __DIR__ . '/db/config.php';
+
+header('Content-Type: application/json');
+
+$response = ['success' => false, 'error' => 'Invalid request'];
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $project_id = $_POST['projectId'] ?? null;
+    $month = $_POST['month'] ?? null;
+
+    $metrics = [
+        'wip' => $_POST['wip'] ?? null,
+        'opening_balance' => $_POST['openingBalance'] ?? null,
+        'billings' => $_POST['billings'] ?? null,
+        'expenses' => $_POST['expenses'] ?? null,
+    ];
+
+    if ($project_id && $month && !in_array(null, $metrics, true)) {
+        try {
+            $pdo = db();
+            $sql = "INSERT INTO projectFinanceMonthly (projectId, month, metricName, value, is_overridden) 
+                    VALUES (:pid, :m, :metric, :val, 1)
+                    ON DUPLICATE KEY UPDATE value = :val, is_overridden = 1";
+            
+            $stmt = $pdo->prepare($sql);
+
+            foreach ($metrics as $metricName => $value) {
+                $processedValue = ($value === '' || $value === null) ? 0.00 : $value;
+                $stmt->execute([
+                    ':pid' => $project_id,
+                    ':m' => $month,
+                    ':metric' => $metricName,
+                    ':val' => $processedValue
+                ]);
+            }
+
+            $response = ['success' => true];
+
+        } catch (PDOException $e) {
+            $response['error'] = 'Database error: ' . $e->getMessage();
+            error_log($e->getMessage());
+        }
+    } else {
+        $response['error'] = 'Missing required fields.';
+    }
+}
+
+echo json_encode($response);
\ No newline at end of file