Price Lists for different item types

Hi, I am a new user and have made a board that staff use to add new applications. When an application changes status to “Completed” then a new item is created in a master board for invoicing our client.

We have a type field on the sub boards and each type has a different value that we invoice our client.

Can you tell me how in the master dashboard I can automate the prices so that if the type is x then the price is y for all the different types.

This will then give me a number field that sums up the invoice amount.

Hopefully that makes sense.