It's kind of hard to tell what you are trying to do from the picture and description. If you insert a conveyor tracking template into your program, any waypoints within it's tree will move based on your conveyor direction and speed. Make sure you set a feature to represent direction of your conveyor and reference it in your conveyor tracking setup.
Currently have a UR 10e doing conveyor tracking. I only have a small window to program all the positions. I want the UR to pick up the tool right when it enters the window and begin tracking, the issue is that I have to program all the points within the window.
I attached a photo showing where the tool is to show where I have to do the programming and the robot is where I want it to start tracking. Conveyor moves from right to left. The Left side of the tool would be the leading edge coming past the robot arm.