I started a Self Employed return but now I realize I need to file a small business return. Can I buy the Turbo Tax for small business without have to reenter all my info

Sorry no ... the programs do not communicate with each other...

To prepare a corporate, trust or partnership return you would need Turbotax Business. This is a separate program from Turbotax Home and Business or the Online Self Employment version. TT Business is a program only available for desktop windows use (there is no on-line or Mac version.)

http://turbotax.intuit.com/small-business-taxes/

https://turbotax.intuit.com/small-business-taxes/forms-business.jsp

https://ttlc.intuit.com/questions/1917225-is-turbotax-business-right-for-me

 

To prepare a personal return, depending on the complexity, you will need a version that prepares Forms 1040 such as Deluxe, Premier, Home and Business, etc.   If you have a Schedule K-1 from either a Form 1120-S, Form 1065 or Form 1041 you will need either the Premier version or (if you also have an unincorporated business) the Home and Business version when using the online program.  

All the 2016 downloaded programs will handle the personal return.

View this product guide chart to see which product is best for you:
https://turbotax.intuit.com/lp/ty14/desktop/lp1.jsp#irs-forms