function missing !

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i am new to this stuff en don't know php,
i am missing a function, i want to be able to decide what to view in the cart
example
books use a isbn nummer and i don't use it white cd's
en the os-version is only usefull by software.

if someone can help my white the code !!!!
i olny can ad new stuff but i can't write new things<??? :cry: ??>
(or id there is a other module to use) plz let me know ;)

thanks!!!

Lighthouse