How to define the Actual Quantity (Unit of Measure) in the Work Order information tab depending on t

unknown

Hello, I'm using IPS (Hansen) V. 8.2.3

For example, If I'm using a Storm Inlet I only want to see EA (each) as the Unit of Measure instead of seeing all units of measure in the system.

I want to define which units of measure an asset is able to use. 

How can I approach this? Does a formula need to be created?

Thank you