Group items tagged

I origionally made an attribute group within a attribute set. When I created the configurable product that uses this set I initially did not use one of the attributes.

I'd like to be able to offer additional information for some product attributes - ideally, to display on the front end next to the specific attribute-but haven't seen any examples or documentation on how to do that.

I would like to add a drop down box in my product listing that will allow the customer to select a specific length of fabric.