You can split a clip into two identical clips that have different start points, end points, and durations.
To split a clip:
Selected clips that intersect the playhead are split into separate clips. You can position, trim, and edit split clips independently.
Select the clips to be split, position the playhead where you want the split to occur, and press S
Selected clips are split where each clip intersects the playhead
If a split clip is part of a blend, or if the split is performed within a blend, Timeline copies the blend settings to the split clips.
If you split an Animation clip that uses a recorded clip as its source asset, the recorded clip is also copied. This copied recorded clip only appears in your Project window after you save the Scene or Project.