# FAQs

### How can I find the profit margin on a Sales Order?

Look in the [Order Details](https://bookstack.iconography.co.uk/books/sales-orders/page/order-details "Order Details") section of the Sales Order screen.

### How can I add a payment to my Sales Order?

Use the [Process Payments](https://bookstack.iconography.co.uk/books/sales-orders/page/order-details "Order Details") section of the Sales Order screen.

### Can I edit the quantity on a Sales Order Line?

Yes, but only on the date that line was added to the Sales Order; this is an important restriction to prevent reporting errors.

To change the quantity, either Cancel the line, or add a new one for the same item.

### Why can I remove the VAT on a Sales Order Line?

This is intended for use with Products that are not typically VAT exempt, but where a user may wish to remove the VAT on behalf of the customer.

Typically, this would be for mobility products, such as riser/recliner chairs, for customers with a disability.

Use the [Order Products](https://bookstack.iconography.co.uk/books/sales-orders/page/order-products "Order Products") section to remove VAT from a Sales Order Line.

See also VAT Exemption Forms.

### What does 'Stock allocation to resolve' mean?

This indicates that a Sales Order Line has been overallocated. See [Stock Allocation](https://bookstack.iconography.co.uk/books/general/page/stock-allocation "Stock Allocation") for more information.