my taxes in prior years were completed by a cpa. there are likely some roll-over or multi-year issues. How can these be considered in TurboTax?

It depends on which types of rollovers or credits you are claiming.

However, in general, as you walk through the credits or places where you would be able to carry over a loss or a credit, there is a question asking if you have any carryovers.  So, you would say yes and then enter the remaining balance from your previous years returns.