IMHO :
The VW Parent File A declares the Drawing Origin ( default = 0,0 ) for all subsequent Container insertions.
If you desire a different Origin then create a Parent File B with Origin offset and it will be the overriding structure for all embedded child-Containers relative to it.
Each file will display data based on the relation to the ParentOrigin.
That being said VW allows for User declaration of unlimited Child-PageContainer Origins via "Set Origin ",
but these supplemental Origins are always relative to the Parent File Origin.
Therefore, since referenced files may be of kind Parent and/or Child, they import into the Parent File C with their Origin information relative to the existing Parent C Origin.
However, this rule does not apply to DWG/DXF imports which may override the VW File Origin in order to rectify the translation
( thereby creating endless hassle for VW Users, et al. ) .