In our current system, we assign an alphanumeric price level/discount to each customer.  Each item also has the same alphanumeric price level

A = no discount

B = 25% discount

C= 30% discount

D = 20% discount

E = 15% discount

We would like to add another price level 'F' for 10% discount, but we do not want to have to go into 1000+ items and key in the discount individually.

Is there a way to set this up so it can be done for all items at one time?