The only solution that I know of is that Ezijobz allows formulas to be created and with the Item Characteristics capability that is applicable to each item, you could designate characteristics that would be percentages.
 
You would have to do a very small custom change (which in Ezijobz is NOT done at the code level) to make the UoM field on the printed report a percentage comparative value field rather than a straight numerical value field.
 
The difference is that Ezijobz is designed to be able to handle that sort of thing "out-of-the-box". DBA is not.

No problem. I hate seeing someone try to make a square peg fit in a round hole....

Lynn,
 
The problem as I see it is that DBA is not set-up to deal with Process mfg. issues such as by-products, co-products, and the ability to input user-defined formulas. You would need to create ALL of these capabilities throughout the inventory and MRP management system AND tie them in to the sales order system to be able to address the needs properly.
 
Personally, I don't see that there would be a pay-off.
 
Just my point of view, of course.