UOM conversion

If I buy a part that comes in a package of 50 for example, how do I now show that I have 50 of these items in stock instead of 1 package of 50?

This is my set-up for that:
image

This allows me to Purchase (1) BX50, but my inventory UOM is in EA

If you do not want to create a UOM Code for every potential box size, mark the box UOM as Part Specific and you can change the box size on each part.