When you post the real acquisition cost (in either the FA G/L journal or the FA journal), you enter the number of the budgeted asset in the Budgeted FA No. field. This will cause the program to post an acquisition cost with an opposite sign for the budgeted asset. That means the total acquisition cost on the budgeted asset is the difference between the budgeted and the actual acquisition cost.
Set up a new fixed asset card.
Open the 
Fixed Asset
Journal window.
In the Fixed Asset Journal window, fill in the fields. For Help about a specific field, click the field and press F1.
In the FA Posting Type field, select Acquisition Cost.
Fill in the number of the budgeted asset in the Budgeted FA No. field.
To post the entry, click Posting, Post, and then click Yes.
Budgetting Disposals of Fixed Assets
Viewing Projected Disposal Values
Filling In and Posting FA Journals