Add +3.00 Euro ONCE if you add 1 or more Articles from 1 category

[shadowkahn]

hello,

 

I have a problem: i am selling softair products and parts.

 

In my online-shop there is a category called "gas and co2" where you can buy bottles with gas for the softairs.

 

my problem: our post-office wants +3.00 euro for sending this items. i want, that on the end the shop

automatically adds 3.00 euro if somebody takes 1 or more articles from this category. It doesn't matter

if the person only takes 1 pc. or 2 pcs. from 1 article or mix it with other articles from this category.

It is always + 3.00 euro.

 

can anybody help me??

 

thx

 

michael

 

p.s.: you can see the onlineshop under: http://www.softaircenter.at