Copy Playing Cells Here ⌘⇞
Currently defined as command-pageUp
Copies the currently playing cells to the selected scene.
Edit Live Loops scenes in Logic Pro — Apple Support
You can copy playing cells to a single scene. This is useful if you want to combine cells from different scenes into a new scene. If you copy playing cells to a scene that already contains cells, the copied cells replace any existing cells on the same track in the scene.