Windows 7: How do you delete a user created folder in Outlook 2010?

I am using Outlook 2010 for 3 individual email accounts. 2 of these are Pop3 Yahoo accounts and the 3rd one is a Gmail account using IMAP.

When using the gmail acc, all outgoing messages leave via my main Yahoo account (don't know why) as the Google acc has no 'Outbox' of it's own, just inbox, deleted items, drafts, junk mail,search folders and sent.

This morning I made the mistake of trying to create an 'Outbox' for my gmail account but all I managed to do was create a sub-folder within 'Sent'. Now I have the problem that all my 'Sent' mail for the gmail acc is going into the new sub-folder.

So, after all that my two questions are . . . . .
1) how do I delete the newly created sub-folder?
2) Is itpossible to easily create an 'Outbox' given my present set up?

Thanks in advance for any help