OK, the mechanics:
Go to Income, select Miscellaneous Income down at the bottom, then select Other Reportable Income, again at the bottom, and enter the description and the -20 there.
However, when I tried to reproduce your situation by entering a fake Oil & Gas Royalties schedule E, it did not produce a QBI. The only place I see for the is-it-qualified checkbox is on the Schedule E worksheet visible in Forms View on the desktop version of TurboTax. The yes/no boxes are both left blank but manually toggling them does produce the desired QBI result. If left untouched, the Smart Check phase will find them and ask you about which one to toggle. They work as expected in my test.
