How to capture different fill levels for containers for a single lot

Summary:

In this business scenario, a drum is produced in gallons where the standard fill level is 50 gallons, but when producing there is a leftover amount that fills a drum to 25 gallons. This is made with the original batch and so it has the same lot number. Other than creating a separate lot for the partial fill, is there a way to separate the inventory in the system to identify there is a partial filled container that can be separately transacted?

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This is for process manufacturing

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