Hi SK,

I have had the same problem. I wanted to create a 3D machines layout.
I can not be of much help - other than 2 cheats.

1)
Use the virtual functionality of SE V18.
I have not used it myself other than the tutorial.
Maybe someone like our resident expert Andrew can help here.
(we should actually start a tip/post on this virtual functionality)

2)
create a refference part that takes up the place of the planes.
Place that first, and refference all others to that.
This "dummy" part can be minutely small and thin - or simply hide it later.

I am sure than is something more straight forward.
I thought however I will answer you so long.
I will ever ask my office buddies later today.

GERT - do you know how to solve it - or simply where to look for an answer?

Thanks,

WB