If I understand what your asking correctly, why don't you just create a series of parametric parts driven off a spreadsheet. All of them can be fully detailed and copied into a new project each time. This way you wouldn't have to worry about iPart children or dummy assemblies. You could have as many parts as you need all driven off the same spreadsheet.
Or, it may pay to look into Autodesk Intent...
Please mark as "Accept as Solution" if it answers your question or "Kudos" if you found it useful.
---------------------------------------------------------------------------------------------------------------------
Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000