Can my business partner use and operate the same QuickBooks account? If so how?
You add them as one of your free users. Depending on what subscription you have detetmines how many users you can have in your company file. It can be partners or employees.
If you mean for them to piggyback onto your account to open a second company Then the answer according to the EULA would probably be not in this lifetime unless the two of you are life partners as well as business partners