Manager's override above a certain line discount percentage (as setup in the user's permissions)

Currently, we can setup manager's override on all Line discount % givem by the cashiers even though their permission says they can give 10% discount as an example.

So, if the POS operations 301 is setup with managers override, if will ask for all Line discount % given by cashier.

We want Cashiers to be able to give the discount defined in the Users permissions but then anything above should ask for the manager's override.