Matt, if you right click the sub-assembly from your Feature Tree you should be able to select the "Make Subassembly Flexible" toggle/button. This should give you the range of motion you previously had in the other assembly.
First question limit angle mates is how you can make the clamp work properly, it actually is how the clamps function. There are limits to the close position and open position on an angular side.
Second question, make your clamp assembly flexible in the main assembly and you will be able to make it move in your top level assembly.
For your first question you can use sketches and path mates to get the desired movement out of your clamp.
I use toggle clamps all the time. What I do is create 3 configurations with sub configurations under them.
The 3 main configurations are: Fully open, fully closed and Clamped (because fully closed and clamped are two slightly different places). Then under the sub configurations, I will show the adjustment on the spindle.
That is how we have our Destaco clamps set up.
I assumed either this was a student exercise or a customer requirement for movement shown at some point.
The main thing most customers want when it comes to clamps is clearance detection around them, can you open and close them without interfering with other parts and operations.
Thanks Dan Pihlaja, that's an interesting trick.
Paul Risley, it's kind of both. I am a life-long student to all things CAD/CAM and even though what I'm building is a real requirement for our E&M department, the mates were not necessary except that I wanted to know how to do it. And my (internal) customer was impressed with the result so it's a win, win for me.
I'm finishing up the design and getting ready to do drawings and am not quite sure how to deal with the angles. You'll prolly see me in another thread picking brains for the best way to do it.