Typically fund creation is a one-time process. Once a fund is created it can be renamed, moved between ledgers, and the allocation can be adjusted. Funds are also copied from one fiscal year to the next as part of fiscal closure.
If you need to create a fund that does not already exist in your Alma Ledger, you can follow the Alma Acquisitions—Creating an Alma Allocated Fund documentation which includes step-by-step instructions with screen shots.