How can I scale a rectangle (with copy) so the new rectangle will be 2 mm bigger in each side?
I think you want Offset here…
There are several options:
1: Scale commands
Scale1D Scale2D ScaleNU note how you start scaling from a snapped point and then snap to the reference point and enter the desired new length. There is a commandline option to copy the scaled result or not
2: Turn on the controlpoints of a copy of the rectangle and move the controlpoints 2mm to the desired new position
3: The BoxEdit panel. Make a copy of the object ( CTRL+C CTRL+V) and apply the desired boxedit
Does this make sense?
Else you could post a screenshot of the situation you are trying to solve.