I'm not sure if I understood you correctly, but you're supposed to connect parts together only LCS-to-LCS, using this button:WayofWood wrote: ↑Sat Jul 11, 2020 7:46 am4. Now I would like to add a LCS "LCS_in_Model" to the model that I could then use to place the subassembly of the two cubes (or my crossbrace in reality) into a bigger assembly. After adding the LCS, I edit it but I can't select a reference (neither a plane, vertice, edge, nor a LCS from one of the parts:
With that button you can choose which LCS you connect, and how to select the XYZ-permutations of the coordinates.
If you want to attach an LCS to a certain feature of your model, you should only attach an LCS within your part into that part; so don't try to attach an LCS of part A into part B. Instead, attach an LCS_A001 in part A to part A + attach an LCS_B001 in part B to part B; and then use the "move/attach a part" tool above. Select part A, press the tool, inside the tool select part B in the list, and then select LCS_A001 in part A list and LCS_B001 in part B list. Then, the parts magically connected, and stay together.