What action does the splice command facilitate?

The splice command is primarily used in editing to facilitate the addition of clips to an existing sequence. This command allows editors to insert new footage or audio at specific points in a timeline without disrupting the overall flow of the sequence. When a splice is made, the existing clips are adjusted accordingly to make room for the new content, ensuring a seamless integration.

The process of splicing is crucial in film and video editing as it allows for the enhancement of storytelling by introducing new elements that complement the ongoing narrative. Rather than replacing or removing material or simply providing visual aids like audio waveform visibility, the splice command focuses on expanding the content of the project by inserting new clips into the timeline. This is why the correct answer highlights the addition of clips to the existing sequence, emphasizing the function and importance of splicing in editing workflows.