How to script ActionMapping for fly up, fly down

I see that while in Editor I can navigate with the Gamepad, can use the right trigger to fly down and the left trigger to fly up. This action isn’t mapped, however, in the Project Settings, Input. I’m unclear even how to search this in the documentation. What name is used for this action? To be clear, this isn’t about continuous flying like in an airplane, Move Up and Move Down would be more appropriate here, just unclear how to effect this type movement. Pretty clear about mapping to Gamepad Trigger Rt and Lt and using +1 -1 for up and down, but the other fields, thanks for your help.