You do not "add" 1A. If you have entered any of the things that go on 1A, the deductions are shown on line 13b of your Form 1040---they go there automatically if you made entries such as the information for the senior deduction, car loan interest, overtime pay or tips.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...
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