I have a category "category 4" that needs to be flat rate shipping.

all the other categories are normal USPS shipping.

Here is my issue,

if they have multiple items in their cart, from the "category 4" and items from the other categories, it show the flat rate option.

I need "flat rate" not to show up if their cart has items from other categories.

I am new to the Zen Cart - and by no means am I a php person.

any help would be appreciated.