beginUndoGroup()

Marks the beginning of an undo group, which allows a script to logically group all of its actions as a single undoable action for use with the Edit > Undo/R

preserveNestedFrameRate

When true, the frame rate of nested compositions is preserved in the current composition. Corresponds to the value of the Preserve frame rate when nested or

preserveNestedResolution

When true, the resolution of nested compositions is preserved in the current composition. Corresponds to the value of the Preserve Resolution When Nested op

PropertyGroup object

The PropertyGroup object represents a group of properties. It can contain Property objects and other PropertyGroup objects. Property groups can be nested to