Setting up sub-accounts to capture income and expenses for a recurring annual event.

Suggestions on how best to handle the following in Quickbooks desktop.  Our organizations puts on a demonstration each year with multiple instructors.

We wish to assign both income and expenses specific to each instructor. As instructors and their subject material change from year to year the names assigned to the respective account will change accordingly.  If I set up an account for each instructor by name for 2021 then I can't use those same account numbers in 2022 and so on.  What I have done for this year 2021 is used an existing account 47250 (5 digits) and created sub-accounts (6 digits) and used the same rationale for 2022 as follows:

47250                    Workshop Fees

472501                  2021 Instructor ABC

472502                    2021 Instructor DEF

472503                    2021 Instructor GHI

472504                    2022 Instructor ABC

472505                    2022 Instructor DEF

472506                    2022 Instructor GHI

Expenses have been set up the same way.

Is this the best way to handle this or are there better ways.  Your assistance is most appreciated.