In Creo Elements/Direct Modeling, assemblies can be marked as inseparable, in Creo Parametric there is an "embedded component".
The structure of the assembly is retained in CAD, but not stored in the database as individual objects, but only as one object. It is often used to identify purchased parts that have only one article number.
However, Creo View does not mark these assemblies as "inseparable". They are normal assemblies with structural information. This can be confusing to a user.
It is an advantage here if there is an "inseparable" option that, for example, hides the structure of the inseparable assembly in Creo View. A user must be able to decide if he want to see the fulls strcuture or the "inseparable" structure. Further options are possible.
See case https://support.ptc.com/apps/case_logger_viewer/auth/ssl/case=15981698
