Nesting means placing one sequence inside another as a single element. The inner sequence (the pre-composition) renders as a flat image frame-by-frame, and that rendered output is treated as a single element in the outer composition — transformable, maskable, filterable, and animatable like any other element.
Method 1: Right-click one or more elements in the layer stack -> "Pre-compose." The selected elements are moved into a new, automatically created sequence, and a reference to that sequence is placed at the same position in the original layer stack.
Method 2: In the Compositor, drag a sequence onto the canvas of another sequence. A nested sequence element appears.
Double-click the nested sequence element on the canvas or in the layer stack. The editor switches context to the inner sequence's timeline and canvas.
The breadcrumb navigation bar at the top of the canvas area shows the nesting path, for example:
Click any breadcrumb to navigate back up the nesting hierarchy.
Changes made inside a nested sequence are reflected immediately in all compositions that reference it. The rendered pre-comp is regenerated whenever the inner sequence's content changes.