Yes. Enter the primary taxpayer and pick Married filing together then enter the spouse's Personal Info. Then when you enter the income it will first ask who it is for. Enter each person's income the same way and place. On a Joint return when Turbo Tax says you it means either of you.
Did you get married in 2018? Did you use Turbo Tax last year?
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.
And info on Getting Married…..
http://turbotax.intuit.com/tax-tools/tax-tips/Family/Getting-Married/INF12006.html