So if we get a product for example for "Dell PC with 4GB ram" but the customer wants "16GB"
how to dismantle or divide the Dell PC into "Dell PC without ram" and "4GB ram"
then use the "Dell PC without ram" + "16GBram"
and the "4GB ram" should be added to the stock
input(Dell PC with 4GBram) + 16GBram = output(Dell PC with 16GBram) 4GBram in stock
OPT_check
(Product Variants) can't sell 4GBram separately also implies that is I have in stock a "Dell PC with 4GBram" and a "Dell PC with 16GBram". @AdamStrauss
(Negative Quantities) -- HOW set "Dell PC with 4GBram" to (-1), set "4GBram" to (+1) and "Dell PC without ram" (+1) then sell "Dell PC without ram" + "16GBram". @CharifDZ