Your corporate customers might require from several policies to very few, or maybe even none. You can manage have them create policies of their choice. You can even have an accept all policy by default where everything will be in policy (so no restriction is required):

Set travel policies by supplier, by dates, by origin destination and other parameters.

Create as many policies as needed and define pricing limits for each, including per flight cabin, hotel night and car rental periods.

Attach policies to trip reasons for greater control and flexibility. Policies for business travel might be different from policies for travel for a training. Give options to your corporates.