Ive got a spreadsheet which can calculate indexes if anyone struggles. It basically follows the advised conventions of odd indexes on longest 9, even on the shorter.
Also takes into account length of approach shots and the remaining shots to acheive GIR, based on an average drive length to avoid pars 5s always being the hardest indexes etc
During any BETA process on OGT, or for any course where designers have yardages and pars all decided then happy to run the numbers on it, just ask.
Ive back tested it against many real courses indexes and it comes out pretty close for the most part. Obviously there are many holes where its not just yardage and hazards etc will effect the index, but will at least give some workable indexes as a starting point.