Editing a configuration file

I have a bit of several part question.

I would like when "selecting a package" upon install, to edit a config file located:

C:\ProgramData\Company\Product\

The issue is, currently the config file will have entries like this:

[Area.119]
Title=Airport01
Local=Scenery\Cities/Airport01
Layer=119
Active=TRUE
Required=TRUE

I would need to make the subsequent, [Area.120], so my entry would look like this:

[Area.120
Title=Airport02
ocal=Scenery\Cities/Airport02
Layer=120
tive=TRUE
Required=TRUE


Any Guidance would be appreciated.