Can I assign parts a price? Confused about parts/fees

After reading some KB Articles, I remain confused about this system. Perhaps it would help if I explained what we would LIKE to do:

1. We add different categories of Chromebook Parts by model and number etc. 
2. Each part has an assigned price as decided by us for use with fees. 
3. When a technician works a broken screen ticket, for example, we add the Chromebook Screen part to that ticket which adds 50$ to the ticket in terms of cost.
4. We add a fee to the ticket that pulls its cost from the part cost so that the fee reflects that 50 dollars. 

I feel like this is possible, but I cannot for the life of me find the visibility on part prices. How can I tell the IIQ system how much a part costs? There is no field for it in “New Part” or in “Manage Inventory.”

Thank you!