Need to fill some vacancies on the coaching staff. I want I will promote my LB coach to DC, and my K coach will be my QB coach my, also I will fire my secondary coach. When doing this the AI prevents me from proceeding after offering the DC and QB coach contracts, then I get in the red where there is not enough cash flow.
To free up coaching salary cap, you need to replace an expensive coach with a cheaper one (often the best place to do this is if you have an overpaid position coach). Since there is no penalty for replacing coaches, the only risk is that your coaching talent goes down a bit.