I'm trying to make my life easier dealing with large assemblies by creating more smaller subassemblies instead of trying to assemble dozens of parts in my assembly file. In my mind, this is an attempt to do more "top-down" style modeling instead of bottom up (though my understanding of top down is very limited). The picture below is of suspension brackets that will be mated to the bottom side of a trailer to mount leaf springs. I'm trying to place the front, middle, and rear brackets all 32" apart (length-wise down the trailer). I thought I could just dimension planes 8, 9, and 10 at 32" and be done. But I can't get it to work. Any suggestions?