Repeat Region Inside a Repeat Selection

I have a page where the Admin can add multiple product options in one step:

Bath Chair: [red] [small] sku price ...
Bath Chair: [red] [medium] sku price...

The [color] and [size] options are select lists driven by a repeat region of the color and size tables. When I apply a Repeat Selection behavior to this row of form fields and repeat it 3 times, only the first iteration has populated select lists with all the colors and sizes, the other two are blank. I don't think you can use a repeat region multiple times in a page. If not, how do I go about populating these lists within a repeat selection?

If I create these 3 iterations of the form row manually (using different recordsets for each row), can I still insert all three rows with a click? Insert Multiple records seems to require a Repeat Selection.

Or is there a better way to do this?

Thanks.