Progressive billing and its default retention rate are set on the bid itself, before you send it, the same Progressive billing toggle and sections covered in Creating a Bid. Override retention on a section only when the contract calls for a different holdback, and write the agreed rate into the contract before work starts.
- Add a Section for one part of the scope, put its line items under its header, then set its per-section retention override.
Bid form: the Progressive billing toggle and section-level retention override.