You are correct, TurboTax Business does not support importing tax reporting statements (such as a 1099-B). Information from such statements must be entered manually into the program. You would use TurboTax Business to complete a tax return for corporations, partnerships and LLCs. You can then import that return into your personal tax return and import your 1099 there, as part of your 1040.
Here is a link that shows a comparison between the TurboTax online products.
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