You have to use a work around to get it done

create a bundle item, include the item being sold in the bundle and use that on the sale

for the item use the weight as the quantity, and rate
the number of bundle items sold multiplies that total
so you end up with […]

Resolution for 'amount should issue: 'I need my invoice and bills to include quantity, weight and rate.Total amount should be calculated by multiplying the three variables. Please help me on how I can do this' available: Yes.

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