# Maintain Service Order
Changes to a service order are done from the drawer that opens after [creating](/release-6.32/voyage-management-system/step-by-step-guides/service-orders/create-service-order.md) a service order.
To maintain an already existing service order, open the **Operations**
**Service Orders** module and click the order you want to change. It will now open in the drawer.
## Editing an order
### Order details
You can change order date, supplier and cost details under "Order Details".
The total cost of the order lines are calculated for estimate (advanced).
### Order reference
1. Click the more icon
at top right.
2. Select **Edit order reference**.
3. Make changes to the reference in the window.
4. Click **Save**.
### Status
You can change the status of the order at all times. There are three statuses, "Estimate", "Revised", and "Final".
1. Click the status label at the top of the drawer next to the order reference.
2. Select desired status.
## Creating order lines
Click
in the "Order Lines" section to create a new order line.
{% hint style="info" %}
**Tip:** You cannot set the revised and final cost of an order line until after it has been created. Open an already created order line from the list to set these values.
{% endhint %}
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