Products Option Admin Multi Choice

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HI,

I am working on my site for woman clothing.

That need to have individual_model_id for each style and colors so i didn't use the zencart attributes for product options.

i modify the collect_info and several files to have those inputs function with my tables on database ,and they works.

I just have a questions

"how do i do multiple choice (examples: attribute checkbox multiple choice), so i can assign multi color id to database ..

Thank you for your time