I could use some help with preparing multi-state returns.

Most of my clients use QBO.

What are your suggestions from start to finish for handling multi-state returns well? 

Are there any excel workpapers you recommend using for helping with apportionment? 

Is there a way of importing the state allocations directly from QBO to ProConnect? 

Any tips and tricks on how to make this as efficient as possible, would be much much appreciated.

Thank you