Yes, you can close your books to lock old transactions, Abeach41S.

Once you close it, our system will zero out your income and expenses and roll up your net profit/loss into the Retained Earnings account at the end of the year. 

Although, I suggest conferring with your accountant if it's okay to close it in the middle of the calendar year. 

If you've got a go signal from your tax adviser, you can follow my steps at the top. You can also check this reference for more details about closing your books. 

If there's anything else we can do, please let us know.