Variable output for completed assembly

Summary:

We have a manufacturing scenarios where the input item is tracked in UOM of Rolls and there is a single output item with UOM of Each.

It's a simple manufacturing process with single operation wherein Sheet (Rolls) are cut into individual pieces (Each).

But the output can be variable and only known at job completion. How can we configure so that we create a work order with the input quantity of an item in Rolls and the output is only known at the end of operation completion.

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