I would like to read certain parameters I will us in my control from a file

I want to be able to use 'constants' in my IQAN read from a file, for example perhaps using the same control system across multiple vehicles but having some vehicles with a lost maximum speed. One way I would use in other systems is a vehicle configuration file to rad the values from. 

I saw the 'variant option selector' which sounded like it might be part way there but it complains it wants n option group and I have no idea how that works never mind if it is the right thing to use