Hello Rachel
Budget pay applications are generally between the General Contractor (GC) and the Owner.
The budget application is based upon a schedule of values (SOV) which is created in the Main contract set up. Each item in the Main Contract SOV is generally linked to a budget item.
Billing periods are set up for the main contract to suit how often the owner will pay the GC.
Cost pay applications are created for each Subcontract supplier and are also connected to the budget. They are associated with the Budget pay application for the relevant billing periods they were on site. The GC could decide to pay their suppliers more regularly or different billing intervals if they want so they have an option to just use the main contract billing periods or could have custom ones.
Every supplier would submit their application to the GC based upon work completed in the billing period.
When they are all done and the GC sets them as 'accepted' they can select 'Update Budget Payment Application' in the flyout for the Budget Pay Application. All completions based upon % ratios are then updated in the Budget pay app.
The GC would then enter amounts for other items not driven by Suppliers such as General Conditions/Preliminaries and Fees etc and then collate all the information to submit to the Owner.
Once the Owner has accepted the application they GC would then authorise payment to the Suppliers. (see page 39 onwards https://bim360resources.autodesk.com/construction-cost-management-with-bim-360/cost-management-workf...)
Send me an email at [email protected] if you would like more help
Thanks, Ian