Batch file Wizard Required

 I have an appplication with one ".ini" file that contains machine specific details as well as a general rule set which changes very frequently.  My challenge is to be able to use Active Directory to copy a new set of rules to each machine without overwriting the machine specific entries.  I'm trying to get the ".ini" file to somehow call or import the rule set then return to the original ini file.  This would allow me to change only the rules for everyone and not their customised settings.  If anyone could help,  it would be greatly appriciated.