Form Question

I've got a couple of nest sub-forms within my main form... it kinda looks like this...

Form 1 - choose Loop from this...

Form 2 - based on Loop selection above, display Typicals
for this Loop

Form 3 - based on Typical selection above, display items

I'd like to have a pulldown loopbox on Form 2 that displays the typicals it's sourcing... unfortunately, it's just giving me all of them.... is there anyway I can limit the contents to those that apply to the selected loop?

Thanks!