A single project can
contain multiple sequences. All the sequences in a project share
the same timebase, which defines how Adobe Premiere Pro calculates
time, and which cannot be changed after you create the project.
To set the default settings for new
sequences, with the Project panel active, choose Project >
Project Settings > Default Sequence, and specify the
number and type of video and audio tracks.
To switch sequences, in the Program Monitor or in the
Timeline panel, click the tab of the sequence you want to use. The
sequence becomes the frontmost tab in both panels.
To view a sequence in a separate Timeline panel, drag
the Sequence tab away from the panel to an empty area.
To open a sequence in the Source Monitor, press Ctrl/Command
and double‑click the sequence in the Project panel. In the Timeline
panel, press Ctrl/Command and double‑click a nested sequence.