Your question is not clear. If you use online Live Deluxe and use the services of a tax expert, then you pay for that. If you decide to downgrade and forego using the help from the expert, you lose the data when you start over. Or are you asking if you can start in online Live Deluxe and upgrade to Live Premium? Yes---you can always upgrade if needed.
We cannot tell from your post what software you are using now.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**