3D Constraints, lock a part in 3d space

 Hello:

I am using the mechanical broswer and mechanical components to build a model.  I have started to use constraints to locate the parts in relation to each other, all of my parts are built using multiple 3D solids.  I have the frame work of my model set in place, with other components placed on top of the frame, I am currently going around adding constraints to lock my additional components to the frame work.  For the frame work I have applied the Fix constrain and picked on one of the solids in the frame, now, below the frame part number in the mechanical browser I have a Fix constraint shown.  When I attempt to locate a part off of the frame using constraints sometimes the frame will move to mate up with the part, and other times the part moves to the frame.  How do I make the frame work part stay put and have the other parts move to the frame.  Every time that the frame moves I lose the location of other parts which are sitting on the frame, that I have yet to constrain...

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