diff --git a/post/invoice.php b/post/invoice.php
index 6d3922f57..4c2c0574e 100644
--- a/post/invoice.php
+++ b/post/invoice.php
@@ -396,6 +396,7 @@
     $qty = floatval($_POST['qty']);
     $price = floatval($_POST['price']);
     $tax_id = intval($_POST['tax_id']);
+    $item_order_id = intval($_POST['item_order_id']);
 
     $subtotal = $price * $qty;
 
@@ -410,7 +411,7 @@
 
     $total = $subtotal + $tax_amount;
 
-    mysqli_query($mysqli,"INSERT INTO invoice_items SET item_name = '$name', item_description = '$description', item_quantity = $qty, item_price = $price, item_subtotal = $subtotal, item_tax = $tax_amount, item_total = $total, item_tax_id = $tax_id, item_invoice_id = $invoice_id");
+    mysqli_query($mysqli,"INSERT INTO invoice_items SET item_name = '$name', item_description = '$description', item_quantity = $qty, item_price = $price, item_subtotal = $subtotal, item_tax = $tax_amount, item_total = $total, item_order_id = $item_order_id, item_tax_id = $tax_id, item_invoice_id = $invoice_id");
 
     //Update Invoice Balances
 
@@ -1082,3 +1083,61 @@
     exit;
 
 }
+
+
+if (isset($_POST['update_invoice_item_order'])) {  
+
+    if ($_POST['update_invoice_item_order'] == 'up') {
+        $item_id = intval($_POST['item_id']);
+        $item_invoice_id = intval($_POST['item_invoice_id']);
+
+        $sql = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE item_id = $item_id");
+        $row = mysqli_fetch_array($sql);
+        $item_order = intval($row['item_order']);
+
+        $new_item_order = $item_order - 1;
+
+        //Check if new item order is used
+        $sql = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE item_invoice_id = $item_invoice_id AND item_order_id = $new_item_order");
+
+        //Redo the entire order of list
+        while ($row = mysqli_fetch_array($sql)) {
+            $item_id = intval($row['item_id']);
+            $item_order = intval($row['item_order']);
+
+            $new_item_order = $item_order + 1;
+
+            mysqli_query($mysqli,"UPDATE invoice_items SET item_order_id = $new_item_order WHERE item_id = $item_id");
+        }
+
+
+
+        mysqli_query($mysqli,"UPDATE invoice_items SET item_order_id = $item_order WHERE item_invoice_id = $item_invoice_id AND item_order_id = $new_item_order");
+        mysqli_query($mysqli,"UPDATE invoice_items SET item_order_id = $new_item_order WHERE item_id = $item_id");
+
+        $_SESSION['alert_message'] = "Item moved up";
+
+        header("Location: " . $_SERVER["HTTP_REFERER"]);
+
+    }
+    
+    if ($_POST['update_invoice_item_order'] == 'down') {
+        $item_id = intval($_POST['item_id']);
+        $item_invoice_id = intval($_POST['item_invoice_id']);
+
+        $sql = mysqli_query($mysqli,"SELECT * FROM invoice_items WHERE item_id = $item_id");
+        $row = mysqli_fetch_array($sql);
+        $item_order = intval($row['item_order']);
+
+        $new_item_order = $item_order + 1;
+
+        mysqli_query($mysqli,"UPDATE invoice_items SET item_order_id = $item_order WHERE item_invoice_id = $item_invoice_id AND item_order_id = $new_item_order");
+        mysqli_query($mysqli,"UPDATE invoice_items SET item_order_id = $new_item_order WHERE item_id = $item_id");
+
+        $_SESSION['alert_message'] = "Item moved down";
+
+        header("Location: " . $_SERVER["HTTP_REFERER"]);
+
+    }
+
+}
\ No newline at end of file