Create BoM using percentage UoM??

I am trying to create a BoM using the percentage UoM. Our default base UoM is set to pounds (lbs.). Our materials weights (in totes) change based on the tote carrier we use, so we do not want to use specified weights for each of the raw material input in the BoM. If I could use a percentage, that would be ideal. I tried creating a BoM, and I saw that there was a percent UoM. Can anyone explain how this is done? How do I set the quantity for the output product as well as the input products?

Here is an example:

Output: Product A = 1,500 lbs (or 100%)

Inputs:

• Raw Material A: 15%
• Raw Material B: 25%
• Raw Material C: 10%
• Raw Material D: 35%
• Raw Material E: 15%

I appreciate any feedback!

Thank you,

Cristina