Learn how to use the Timeline panel in Premiere Pro to edit sequences loaded in the Source Monitor, keeping the original source clips on all tracks intact.
Premiere Pro lets you load sequences into the Source monitor, and edit them in the Timeline panel keeping the original source clips on all tracks intact. This way, the sequence doesn't become a single nested sequence clip. You can now use segments of other sequences containing individual source clips, edit points, transitions, and effects, much like copy/paste.
Use the Nest Source Sequence toggle option in the Source Indicator context menu to control how source sequences are edited into the current sequence. Toggle the option off to edit source sequences into the current sequence with individual clips on multiple tracks, edit points, and transitions. This type of editing resembles a copy/paste operation. Toggle the option on to edit source sequences into the current sequence as a nested sequence clip.
Because sequences can contain multiple video tracks, the source indicators in the Timeline's track headers now display all source tracks, including multiple video tracks. You can choose the video tracks to edit into the timeline when you load a sequence into the Source monitor.
Tracks, even if empty, in the source sequence are available as source tracks in the patch bay when the sequence is loaded in the Source monitor. In addition, editing an empty segment from the source sequence into another sequence doesn't affect the target sequence.
Here is an example of a sequence containing three video tracks and four audio tracks loaded into the Source monitor. The source tracks are visible in the Timeline's source indicator column (far left).