I need some help with checkboxes on a userform, here is the situation...

I have a userform with a multipage with 5 pages, products. For each product page, there is another 3 page multipage, months. Each month has 5 checkboxes (dates- displayed in the caption) on each page, so 15 checkboxes per product.

Here's what I would like to figure out:
1. I only want to allow one checkbox (date) out of 15 to be checked per product.
2. There is a command button on the userform that once it is pushed, I'd like the one date that was selected per product to be displayed on a sheet within the excel workbook.

Any help would be very appreciated! If I need to supply more info, please let me know, thanks!