This Ableton tutorial covers two inverse clip operations in Arrangement View: splitting a clip at the insert marker and consolidating multiple clips into one. Both are accessible through the Edit menu or via keyboard shortcuts, Cmd+E and Cmd+J on Mac (Ctrl+E and Ctrl+J on Windows).
Splitting places the insert marker where you want the cut, then triggers the command. Consolidating requires selecting the clips you want merged before applying it. Knowing both shortcuts makes arranging and restructuring sessions significantly faster.