The most simple way that I've found is to use classes for restricted funds.  Since that's basically all we use classes for, it works for us.  Also, I'm not an accountant and found it difficult to understand some other methods.

So, I have a class called Unrestricted Funds, and a class called Restricted Funds.  Under the Restricted Funds class, I have a class for each of the Restricted Funds accounts, for example, 2021-2022 Company X Scholarship."

Then I can do an all time report that sums up expenses/revenue by class for all restricted funds classes.