In Buildxact for each order item you have the ability to set a Category which the costs will be assigned to, this is handled via the 'Actuals Category' column.
If you have created an order based off existing items, the category will be set automatically based on the selected item.
However if you have added a new order item this field will be blank. Populating this field will be crucial for accurate estimate vs actual cost recordings.
If you've managed to receive costs on an order when the category was blank, here's how you can backtrack to assign the costs to the correct category
Please see the below guide for Cost Plus Jobs: