The other changes value in the case of partial sale against that order.
Answer : You need to manually modify the other charges during the sale entry. Other charges cannot be linked with the quantity as the value and quantify ratio differs for different product.
For example – There is a big difference in value of 1 gms of gold and value of 1 gms salt. You may have both the item in the same bill.
It’s difficult to find out the ratio and then divide other ratio in that proportion.