The project module in AX has a lot of parameters to control how you want to manage a project. If you are looking to use the cost control form on a project you might want to look at the cost control methods parameter. There are two options total budget and remaining budget. The main purpose of this is to set how the cost control form display values.

Here is a quick overview.

AX2012 R3 CU11

Cheers

Lachlan