Your composite shots are listed in the Media panel along with your videos and other media.
This means that you can work with composite shots in the same way you would any other media asset, including adding them to the editor timeline or even inside another composite shot's timeline.
Composite shots can also be organized in the Media panel like any other asset. See Organizing Media for details.
Working with Multiple Timelines
A project can contain multiple composite shot timelines, plus the editor timeline. You can have multiple timelines open at the same time, with the currently selected timeline displayed in the Viewer.
Switching between timelines is as simple as click the timeline's name tab.
You can close composite shot timelines without losing any work. Simply click the 'X' to remove.
Closed composite shots can be re-opened by double-clicking them in the Media panel. If the composite shot has been used inside another timelines (see Embedding Composite Shots) you can also double-click the layer name to open it.