step 1: If you already own AIA billing ($500), then to activate it, you must go to help>premium features. Then, click to activate as shown below. You will not be charged for this. The activate simply activates it but only if you have ordered or already own AIA billing within Total Office Manager.
Step 2: You must then go to Edit > Preferences then in the preferences screen click on Customer:Jobs and make sure the box labeled use AIA Feature is clicked.
Here are some additional help articles that you might find helpful.
Using AIA Billing
AIA billing overview
If you would like to purchase the AIA billing feature, please call 913-492-9930 and ask for the sales department.