You could start here https://http-download.intuit.com/http.intuit/CMO/accountants/tax/2021/lacerte/documents/2021_LACERTE...

REP is the fee charged for extra returns outside the firm license, e.g. new state, 706, ...

There is also a charge for "seats" - i.e. workstations. One office with two workstations that 6 people share is charged for 2 workstations. 

Ask the boss for the renewal contract - it should have the breakdown.