You'll enter your spouse's income the same way that you enter your income.
When you go to the section for your business you will see your business named there. Below that you'll see a button that says 'add another business'. If you click that you can add your partner's sole-proprietorship. The system will ask which one of you the business belongs to in order to start.
You will do that with all of the items that your spouse has in order to add them to your TurboTax account. All of your items are already in there but you need to add your partner's items. Each time the system will ask which one of you it belongs to and you will indicate your spouse.
@stynen
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