Sorry but there are more questions:
In HackCase-OB1.FCStd
I am not sure what you mean by Combo View as I am battling to find where " XY plane is offset with an expression"Also in "Sketch002", a quite special tip. If you look at the "Z Position" of the sketch in the Combo View, you'll see that it's not mapped to the face of the box, but to XY plane then it is offset with an expression. It allows to stick the sketch to the correct face while being immune to a face renumbering by FC.
in HackCase-OB2.FCStd
I can see that it is not fixed to the origin but it is locked to the x-axis. Are you simply ensuring that it does not lock to the orgin and if so why is this better?Place the sketches differently vs. origin planes to prevent call to sketch offset or datum plane.
I have toggled the "Refine" setting but can't see what it does i .e. I can't see seam lines appearing/disappearing and so I think that I am misunderstanding what it being said."Refine" property is set to "True" in the properties of "Pad001" to kill the seam lines
Once again many thanks.