Use this screen to enter and maintain change orders. Change orders are additions or reductions to the original scope of work specified in the contract. You can use them to track revisions caused by modifications in the project's scope of work. 

If you want the budgets to be updated when an approved change order is saved, make sure that you select the Update Baseline Budget with Approved COs and Update Workplan Budget with Approved COs check boxes on the Configure Project Budget Settings screen.

Use this screen after saving modifications on the Manage Modifications screen.