How do I import my buy-sell (Schedule C) data from TD Ameritrade?
I believe you are in the wrong section (and wrong tab).
Look for the Personal section and then Investment Income.
I forget what I did last year (getting way too old), but I imported something rather than manually enter hundreds of trades (mainly options).
You can't import them to Schedule C for your business, you can only import them for Schedule D.
How to import a 1099https://ttlc.intuit.com/community/entering-importing/help/how-do-i-import-my-1099/01/26254