Hi all.This example is a 20 meter box, with a 20 x 20 meter plane at the same elevation as the top of the box. That plane is then selected and the attachtool run to give it the properties of a platform. I gave the 20 x 20 plane no material, because it isn't visible.The attached zip is the gmax file and also the ASM and XML files.

Cheers... that works.reinstalled my gmax ... something must have corrupted because its okay now. thanks for everyone's helpgaz