We have requirements like: requirement is X1, we can make x1 from either y1/y2/y3/y4/y5..........
it is not decided at sales order stage. After receiving sales order Planning decides whether x 1 can be made from y1/y2/y3/y4.......... based inventroy and all.
Suppose we apply here VC. Then at what stage we have to put characteristic values so that system can select appropriate BOM Components.