This command has the following input parameters:
SeparateMode - Separation mode. If SeparateMode = SingleSurface, a single surface will be segmented according to SeparateAngle (requires selecting a face on the mesh to be separated). If SeparateMode = AllSurfaces, all surfaces will be segmented according to SeparateAngle. If SeparateMode = BoundaryLayers, boundary layers will be segmented. If SeparateMode = Intersections, intersections of multiple faces will be segmented. If SeparateMode = InternalParts, the parts of the mesh inside a solid will be segmented (requires selecting the solid used for separation). If SeparateMode = AllPolylines, all polylines will be segmented according to the separation angle.
SeparateAngle (for SeparateMode = SingleSurface or AllSurfaces) - Defines the separation angle.
AbsoluteAngle (for SeparateMode = SingleSurface or AllSurfaces) - Defines whether SeparateAngle uses absolute angle.
SeparateIntersections (for SeparateMode = SingleSurface or AllSurfaces) - Defines whether to segment intersections.
ExactInside (for SeparateMode = InnerParts) - Defines whether the separated part must be strictly inside the solid.

Select the face(s), mesh(es), or solid(s) to be separated and use this command. The mesh will then be segmented according to the requirements.

Here is an example you can try: DSeparate.3dm.