Yes, you can go back to those sections and delete your entries, but you will also need to delete the forms you created in your return when you made those entries. See this Help Article for how to view and delete forms in TurboTax Online.
The forms you are looking for are Schedule C and Form 2441, and any related worksheets that you see in your return. Then you can go back and re-enter this information, starting with your wife's business.
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