How do I clear out multiple expenses and stop auto import?

I set up automatic importing, and because I imported my personal checking account as well it's listing tons of expenses that aren't business related. So when I add my own business expenses, they get lost in this huge list. I realize this was a mistake on my part but I'd like to somehow clear out my expenses list so that I can add only business expenses. I'm not going to go through and delete each one manually.

Also, I want to stop auto-bank importing, but I don't know how. On the import page I hit the delete button next to the account names thinking that it would stop importing for that account, but it just deleted that account all together.

Thanks for any help.