Thanks for quick answer.
By the way - I am using this feature (nested RC) right now.
And I have a problem - when RC object is used as segment in another RC object this first RC is just mesh - not instances of original object.
When I use this second RC as segment in another third RC ad so on - I get one BIG mesh - not set of instances of very original object.
Is there any way to avoid this?
Sorry but my English is poor - I hope you can understand whan I mean