What is the Pricelist field on the Customer Standard Form used for at the Account Level

At the Customer Site Use level, I understand that the Pricelist entered defaults on the Sales Order, but what functionality is the Pricelist entered at the Customer Account Level used for in OM (if any)?

Also, is there any method to default the Pricelist entered at the Customer Account Level down to the Customer Site Use (Ship To) level?

Thanks in advance!

Evan Rosa