I think I understood. Yes, your situation is not easy. I normally create a new layer, move that big object to this layer and I ungroup it. Then I have the individual sub-objects as isolated objects, but I still have them more or less grouped because they are all together in one layer. Having them as isolated objects, you can now select each sub-object by point and click in the different views. After all adjustments are done, you can group them again.
Now, I hope that all I wrote is possible in Vue 6 Pro...