You will go back to the same section of your return where
you entered your Form 1099-R to enter one for your spouse.
When you add another Form 1099-R there is a question on the
screen titled, “Tell Us Which 1099-R You
Have” where you will designate This Form 1099-R Belongs To next to
your name and your spouse’s name. Choose
the appropriate one and be sure to answer the follow-up questions with that
person in mind.
Take a look at the information below for detailed
instructions to add a Form 1099-R for your spouse.
https://ttlc.intuit.com/replies/4194737