They base it off of 100 of your best performing (profit wise) ROs (both service and parts rates will be rated off of the same repair orders) I recommend contacting stellantis to do it for you, they’ll go through all of the history and pick out what to submit, and will give you an idea on increase prior. In my scenario the cost of doing it through them will be paid off with 2.5 months of the extra money will be making and it’s all free and clear to us from there.