TurboTax is only for self prepared returns. It does not have the forms needed for a tax preparer to use. You would need a professional software if you are preparing returns for people.
If this is like a family member you are trying to help, you can work together with one account. One of you will have to be the one designated to jump through the identity hoops each time.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"