You can simply add them both one at a time. After going through the steps with the first one, you can add a lender when you get to the Your 1098 summary screen.
Or...
To enter a 1098 form:
- Open your return (if not already open).
- Enter "1098" in the Search box.
- Click on "jump to 1098" link.
- Enter your additional form information (repeat steps as necessary).
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