hoist a part of omnigraffle document

[steve]

I just saw mindjet mindmanager in action. You can open and close parts of a mind map. Is this possible to do in omnigraffle? It is a cool feature when you want to focus on a part of a mindmap.

Thanks,
Steve

[steve]

or is it possible to hide portions of a document?

[JKT]

If you put different portions on different layers, you can hide individual layers.