How to customize PR / RFQ / BPA document sequence numbers using certain DFF in the respective doc ?

Business requirement is to generate the PR number basis certain DFF defined in the requisition. For example - A requisiton number will consists of 4 segments -

1. Segment 1 - a constant 2 digit number to determine this is a PR. (for ex 21)
2. Segment 2 - a single digit to determine the item category / transaction type ( for ex 1 for supply / 2 for general services )
3. Segment 3 - 3 digit number determined from the value chosen from the DFF Lov 9 for ex 501 if requisition is sole source / 502 for direct award )
4. Segment 4 - 2 digit number showing the year in which the requisition is raised and will be incremented every year ( for 2024 - it will be 24 )