Superior hiearchical mailbox creation, after the fact

[Ross Boylan]

I've created INBOX.a.b, INBOX.a.c, and others.  To my suprise, there is no 
INBOX.a folder.  This was discussed previously on this list (2/28/06, similar 
to this messages subject), and is Cyrus's expected behavior.

I've now decided I want a folder INBOX.a, that is something I can move 
messages into.

Is it safe to create such a folder, or will it cause problems, for example 
wiping out the current folders under INBOX.a?