The software always had an internal number for every proposal number, but now it is displayed on the copies that are sent to the customer - emails, PDFs, etc.
The proposal is like the P3 Invoice. There is a prefix to identify the technician or office, followed by a counter. With 9.0 we have also added a suffix to denote which option the customer selected - "a" for the first proposal option, "b" for the second proposal option, etc.
Example Proposal Number