SALOME has some additional features allowing to edit your study within a definite component: Undo/Redo functionality and Copy/Paste functionality (currently used in GEOM, VISU).
To undo/redo an operation:
In the main toolbar click one of the icons or from the main menu choose Edit > Undo/Redo option.
To copy/paste a definite object:
In the main toolbar click one of the icons or from the main menu choose Edit > Copy/Paste option.