Multiple attributes within the same group

Hi,

I am in the middle to putting together an auto parts store. I am setting up attributes to show make/model for fitment. Some parts fit more than one car. I am trying to add more than one car to the attribute but it will only save one. For example...........

Car Make - (Manufacturer name here)
Car Model - (model name)
Car Model - (model name 2)
Car Model - (model name 3)

It might seem strange wanting to do it this way but I am using layered navigation with search by attirbute. If I put all the different models into one "car model" field then it displays as that on layered navigation. I need them to each display separately for search/filtering purposes. Is there a way to change the code so it will allow more than one "car model" field to be saved.

Thanks

Any ideas on this one??

Did you manage to figure this out? I'm after the exact same thing.

I have a spare parts store and have products that fit multiple appliance models. I need to add multiple attributes (appliance model numbers) to specific products.

Any modules out there that allow this?

Please post if anybody figure out a solution. I'm after the same thing