How do you remove splitted clip from original source

[defaultq6wua5kfxhcc]

This is really hard to explain so let me break it down:
You have a 5 second clip and you decide to split the clip
Now how can I remove the layer source from the splitted clip/how can I make it completely unrelated to the original source that i splitted from.

[defaultq6wua5kfxhcc]

**How can I make it completely unrelated to the original source that i splitted from so its a seperate piece of media

[RobShultz]

Maybe select the clip/right click/precompose/make pre-comp length of selected layer.

[Mylenium]

You can't and that is that. It's inherent in the term "non-destructive editing". You can only isolate individual segments in a given program which in AE's case indeed means you create a pre-comp containing the clip and then you use that pre-comp as a layer instead of the actual source as Rob already advised.

Mylenium

[Rick Gerard · Accepted solution]

If you have trimmed a source file, a video, and you want to save the project so that that only contains the trimmed portion of the video you have to do the following:

Select the trimmed footage (movie layer) in the Timeline and select Pre-compose/moving all attributes to the new composition and trimming the new comp to the layer length and opening the comp. 

Then, with the new composition selected in the timeline, go to the Composition/Pre-render menu to render a visually lossless copy of the footage and replace the layer in the original composition with the newly rendered footage. If you have not fouled up the Render Cue's presets by editing them your project will now have a new footage source file that only includes the trimmed frames and you can delete the original footage file from the project.

Be aware that the new video file you rendered will be lossless and the file size may be much larger than expected, but you will no longer need the original untrimmed footage in the project. Unless you are an expert in video compression video standards, do not fiddle with the presets or customize the render settings.