You can replace frames in a clip with an entire source clip. There are two ways to replace clips gesturally:
To perform a Replace frames operation:
The current frame in the source clip is matched to and replaces the frame on which you dropped the source clip and the source frames before and after the current source frame replace the corresponding frames in the target clip.
To perform a Replace Ahead operation:
The Replace Ahead cursor is displayed.
The current frame in the source clip is matched to the frame on which you dropped the source clip and the frames after the selected frame in the target clip are replaced with the frames of the source clip, including the frame on which the source clip was dropped.
To perform a Replace Back operation:
The Replace Back cursor is displayed.
The current frame in the source clip is matched to the frame on which you dropped the source clip and the frames before the selected frame in the target clip are replaced with the frames of the source clip, including the frame on which the source clip was dropped.