Vacation home sale/rental

Sold a vacation home.  Used as a rental for 2+ years and 2nd home for last 5.  Business use is 20%, personal use is 80%.

TT instructions say to enter just 20% of the buy/sale data in the "Sale of Business or Rental Property" section.  Where does the 80% buy/sale data get entered?

I thought it would be in the "Investment Income" section under 2nd home.  However, if you check the "Rental" use button about five pages in; the program directs you back to "Sale of Business..." and wants to remove the entry.  Where should I report the 80% personal use?