FND
Sausage sheet
Total weightlb
Assigned0
Out with cheese0
Unassigned0
Customers0
Products0
Leave the total blank and it adds up the customers' weights. Type a total instead and anyone without their own weight splits what is left of it. Click their cells to pick products; open cells split that customer's weight, typed cells hold.
Show:

Totals

Select a cell
Cell
Set lb
Customers Columns
File Print