I am most likely not using the terminology correctly. This is my first non-simple-cube-type design. I am making a plastic enclosure for a PCB. So first I drew the main box. Then I drew a Sketch, Surface-Extruded it and then used it to Split the big main object (full enclosure) into 2 pieces. The base of the enclosure and the top part of the enclosure. This is all fine and dandy, except I noted I forgot to Smart Dimension a group of cutouts on the "parent" object that I split from. So I right click the object and choose Edit in Context it has the "->" showing it to be an external reference looking at the help files. The file opens up, I edit it, and now I see no change in the split part. I do see it "updating" when I go back to it, but nothing is updated. For kicks, I put in a big rectangular hole in the case in the main full enclosure object, saved and went back to the split of the top. It updates, but no big stupid hole confirming it is not updating from this live file.

What have I done?!?!?!

I am guessing (hoping) it is a simple fix like forgetting to check a checkbox somewhere to keep them linked. I have done lots of editing on this split part adding pieces and holes for mounting hardware etc that the main piece does not have. I do not really need the main piece to be updated I suppose, but I can't seem to edit the main part standalone to move these groupings of cutouts over a couple millimeters.

Any help would be appreciated. Thanks!