InfoPath Dev

In Infopath 2007, I want to create a section that contains 12 variables. Users should be able to select 1 or all 12 if they need to. Not sure how to do this. I experimented w/ radio buttons and could not get passed it letting me selected only 1 button. The form will be uploaded to a Sharepoint 2010 form library.

Thanks

Ideally, what I would like is that all 12 variables be in 1 section and when it is exported to Sharepoint, Sharepoint would list the check variables in 1 column and not 12 different ones.

How about using a Multiple Selection List Box with the merge option for the promoted property, or having a non-displayed field that uses the double-eval trick to aggregate the checked values in 12 checkboxes and promoting that?