Yes, assemblies, exactly. Previously if you had multiple relationships then you sort of had to do things like create rigid subassemblies. I’m looking forward to learning about this ‘multi constraint’ feature.
Re offsets, I ‘think’ they removed the restriction that you couldn’t offset FROM an offset profile. That’s good because the ‘old’ set up, if you offset from a projection, for example, to create a clearance profile, you couldn’t offset from that new profile if you wanted to add a fixed thickness. You had to offset the second profile from the projection. If you change the clearance, your thickness gets messed up.