Is there a way to combine turbo tax accounts when going from married filing individually to married filing jointly so it autopopulates past information?

No.  TurboTax online accounts cannot be combined or merged. 

I was afraid of that. They should allow it - I'd pay for that option. Thanks for the quick response.

When did you get married?  Did you file last year as Married filing Separate or as Single?

You can not transfer from or combine 2 returns or accounts.  Just pick the return for the spouse that has the most complicated return to enter or has any depreciation or business or  more investments.  Or use the account for whoever you want to be listed first going forward (by the way you can not change the order of the names).  Then add the other spouse's name, ssn and info to it.

You should usually  file a Joint return which is only 1 return combined for the both of you.  Make sure to stick with this one account for the future.  Just ignore the other spouse's account.

Getting Married FAQ

https://ttlc.intuit.com/community/tax-filing-status/help/what-does-getting-married-mean-for-my-taxes/00/1756642

And info on Getting Married…..

http://turbotax.intuit.com/tax-tools/tax-tips/Family/Getting-Married/INF12006.html