Module Subsystem allows you to select and define a set of modules as the subsystem used for analysis. The selection can be either based on including or excluding certain sub assembly branches in the Assembly browser or by a previously defined control volume. Only the selected modules will be shown in the 3D graphics area for easy visualization of the subsystem definition. Similar selections are also available in the Edit Modules & Connections tab in the Analysis Manager. When setting up analysis for a subsystem, boundary condition is set in such a way that connections not owned by modules in the subsystem are not realized with the connected tagpoint set free (not constrained), and connections owned are realized with the tagpoints on the opposite end of the connection (Point B) constrained to the ground. This option is available in the right-click context menu for modules.