Line 1, Line 2, Line 3 feed Line A. What method to apply on Line A. that first priority for entry is given to MU of Line 1, if 1 is empty take MU from 2 and if 1 and 2 both are empty only then take MU from 3. . Priority 1>2>3
Please find the attached model. This is one of the way to model your scenario.
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