To Nest A Sequence In Another Sequence; To Open The Source Of A Nested Sequence; To Reveal A Source Frame From A Nested Sequence; About Subclips - Adobe PREMIERE PRO 2 Manual

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You can set a nested sequence's In and Out points as you would other clips. Subsequently changing the source
sequence's duration, however, does not affect the duration of existing nested instances. To lengthen the nested
instances and reveal material added to the source sequence, use standard trimming methods. Conversely, a
shortened source sequence causes the nested instance to contain black video and silent audio (which you may
need to trim off the nested sequence).

To nest a sequence in another sequence

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Drag a sequence from the Project panel or Source Monitor into the appropriate track or tracks of the active
sequence, or use any of the editing methods for adding a clip.

To open the source of a nested sequence

❖
Double-click a nested sequence clip. The source of the nested sequence becomes the active sequence.

To reveal a source frame from a nested sequence

If you want to reveal a clip in a nested sequence (for example, to edit it), you can quickly open the source sequence
at the exact frame you want to reveal.
In the Timeline panel, drag the current-time indicator to the frame that you want to reveal in its original sequence.
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2 Press Shift+T to open the source sequence in the Timeline panel, with the current-time indicator at the frame you
specified in the nested sequence.
3 Double-click the clip where the current-time indicator rests to open the clip in the Source Monitor.
Subclips

About subclips

A subclip is a section of a master (source) clip that you want to edit and manage separately in your project. You can
use subclips to organize long media files.
You work with subclips in the Timeline panel like you do a master clip. Trimming and editing a subclip is constrained
by its start and end points, but you can adjust it to include more or less of the master clip.
Subclips reference the master clip's media file. If you delete or take a master clip offline and keep its media on disk,
the subclip and its instance remain online. If you take the original media off disk, the subclip and its instances go
offline. If you relink a master clip, its subclips remain linked to the original media.
If you recapture or relink a subclip, it is promoted to a master clip, and all ties to the original media are broken. The
recaptured media includes the subclip's referenced portion of the media only. Any instances of the subclip are
relinked to the recaptured media.
To use a master clip and its subclips in another project, import the project that contains the clips.
See also
"Source clips, clip instances, and subclips" on page 107
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User Guide