The option is at the very beginning of the Interview. If you didn’t choose to prepare your returns together at that point, you will have to start again, if you are using TurboTax Online.
Here is how to add your spouse's tax return to your own: https://turbotax.community.intuit.ca/replies/2647707
mansur18
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Carolyn Higgins
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chiang.henry
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banksrw
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