You make a new space layer by offsetting the unit in its file. I believe the tag is something similar to ZLayer offset or something like that. Then just specify the off set.
As a side note, please do not triple or double post just because noboddy is responding. We all see your message and bumping it is against the forum guidelines that you agreed to upon regestration.
> Lucas Forums Moderator
> Petroglyph Forums Moderator
> Unofficial Petroglyph Fan Forums Global Moderator