版本
Work units can be nested inside other work units. When this is done, the content of the work unit is delegated to the nested work unit, instead of the parent work unit. This allows to place several work units under a common actor-mixer object, providing common behavior and mixing properties for the nested work units.
The nested work units allows a finer granularity in the file separation, reducing potential conflicts when merging.
Nested work units are saved in their containing physical folder. For work units, names must be unique across a single physical folder.
Nested work units can be created under the following object types:
Physical folders
Work units
Virtual folders
Actor-Mixer