Prerequisite: A reliability file was created and the BOM Modules view is active.
In the BOM Modules view right-click on the element Overall system. This virtual assembly group
provides all assembly groups of the BOM.
Choose New → New Module - Outcome: the dialog "New assembly group" will open.
Enter a Name for the module. Any existing modules can be detected by using the filter facility.
Click OK. - Outcome: a new module was created and added to the "Overall system".
This procedure also works on BOM file in repository and PSS view.