Go to http://quickbooks.intuit.com/online/
Click Buy Now or Free 30-Day Trial for the version you want (Simple Start, Essentials or Plus)
On the page that asks for your contact info, at the top, you should see Already have an account? Sign in
Sign in with the user ID and password you use for your other company subscriptions. You will now be setting up a new subscription under the same log in information.
