You already have a QuickBooks Online company and want to give our service a try, but you don't want to us to sync to your current QuickBooks Online company.
You can always sign up for a QuickBooks Online free 30-day trial using your same email account. This will create a new company associated with your email account. When you log in, you'll be asked to select which company you want to use.
You can sign up for a free 30-day trial for QuickBooks Online here.