You can calculate your on hand inventory across items that do not share a unit of measure by setting up a transformation.
Item to Item Transformation
Sometimes you buy a product in one form, but sell it another - but only some of the time. This is a case when you need an item to item transformation. Steps:
1. Create the item you're buying
2. Create the item you're selling
3. Navigate to the bought item and click on "transformations"
4. Select the selling item
5. Setup the transformation between the two items
In this example 1 x 100 Ct Bag = 3 x 10# Bags
See it in action using the video below: Buy something in counts, sell it in pounds.