On the other end of your 3 way you need to junction the common with the correct traveler. Once you identify the common it doesnt matter which of the other two travelers you use on the single pole.

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Changing a 3 way switch to single pole. A single pole has 2 terminals the line can go on either one but normally you put the line on the bottom screw the other to the light on the top screw top of switch shows on when switch is up. Remove the two screws holding the switch in place and carefully pull out the switch. Identify the common and wire nut it with a traveler. How to wire a three way switch to a existing single pole light switch circuit. There are actually several ways to install 3 way switches and heres a good resource with diagrams to explain alternate options. Turn the screws counterclockwise and remove the switch cover.
Turn on power and test. You would use one of the dark colored screws with one of the light. Start with the three way switch that will be removed. You dont need the other terminal on the three way switch so its fine to cover it over with electrical tape to ensure the terminals dont get mixed up. With the voltmeter verify that the power. To use a three way switch as a single pole one connect the hot wires to the common terminal and the traveler on the same side of the switch body.
Converting a single switch circuit to a 3 way switched circuit. Dominick amorosso decemberj2012 110 volt electrical 11 comments 24039 views in this video i explain just how easy it is to add a three way switch to an existing single pole one switch lighting circuit. Remove the switch cover plate by removing the two screws. You need to use the common on your single pole. How to change a 3 way switch to 2 way remove the three way switch from the circuit. Heres why its not working.
In todays article im going to show you a common lighting scenario with a single switch and how to incorporate two 3 way switches. The switch is now exposed. Published on apr 7 2020 you can wire a 3 way switch as a sigle pole switch by finding which screw terminals work together. Turn off the power to the circuit at the breaker box.