Default Model levels sync to Sheet model levels

All

Application MS V8i @ CE

Background:  

I have a DGN workflow that simulates a typical DWG workflow.  ie a sheet/plot file that contains a default model 2d /3d and a sheet model.  The default model will contain a series of reference files @ 1:1 and GEO located ie grids, plans etc.  The same file will have a Sheet model, which will have its Default model referenced into it @ ie 1:100, thus to create a view port.

The issue:

I want to be able to control the Sheet views/levels etc, so that any changes made to the default model are automatically updated in the Sheet model.

I know there are variables that can Autosync levels, but I only want this to be in the sheet models not anything below this.

Anyone have a solutions...

Thank you 

Ian