Situation: two walls of multi-layer construction on the same axis of different thicknesses.
For example, a brick - 250mm + 10mm plaster on each side. and the same, but 510mm thick.
Please tell me if there is a setting in which you can set the plastering of the end of the walls?
Ok. What you are trying to achieve is not quite the same...
But the principle is similar. Create a new composite with zero core thickness and center reference line, then join the two ends with reference lines on the plaster. Like this.