I was having the same issue. Went through the various sections over and over - so frustrating! After about an hour and a half with a "tax specialist" who had me going over and over the same sections, he finally found it.
When you're in the Business tab under Business Income and Expenses, go all the way down to "Less Common Business Situations". The last section is "Sale of Business Property". When you click on "Update", the first box is "Sales of business or rental property that you haven't already reported."
It is the only place I have found to enter info including the Sales Price and Cost of Property Plus Expenses of Sale. I hope this is the right place as that's where I'm entering it! Good luck to you!
