Pipeline easement on undeveloped land

You will enter this in the investment section of TurboTax as a sale of land (personal use)

You can enter the sale of the land by selecting the following:

1. Federal
2. Income
3. Show More next to Investment Income
4. Start next to Stocks, Cryptocurrency, Mutual Funds, Bonds, Other (1099-B) 
5. Select Other
6. Continue through and select land for the type of investment
7. Answer how you obtained it
8. You will need to enter the selling price, dates and the cost basis   

Note, your navigation sequence may be slightly different.  You can also use the Jump to feature by entering investment sale in the search bar at the top of the screen. 

When you are asked about the basis in your land, you will need to determine how much that particular section of land cost.  So if you have 10 acres and you paid $10,000 and you sold the rights to 1 acre, your basis would be $1,000.  Then if you ever sell the rest of the land, your basis would be reduced by that $1,000.