hey enhzflep, thanks for the reply...

ived tried to separate them into small little peices and individualy do it but it still wont work and both peices end up disappearing.

ived also even tried just attaching a simply polygon cube and it wont even work aswell...

if this keeps on happen i might just have to do what you said before, which i was just thinking a couple of mins ago which is to do the levels seperately and then just combine and merge vertex's at the end with a finished result... which is abit of a hassel but it will get the job done.

thanks for the reply again... cheers
marlon