Can one <change-folder> to a non-mail folder?

[Chris Green]

I want to create a macro to navigate to my "shopping" folder which
holds directories where I save E-Mails about shopping.

I can't do this directly because the shopping directory doesn't
actually have any mail in it, it's all in sub-directories of shopping.
I get the error "/home/chris/mail/shopping is not a mailbox".

Is there any way of creating a macro to do this?
 
-- 
Chris Green