Defenition file

Hi- After loading several different liveries of both the -800 and -900 and configuring each aircraft's equitment to how i like it, i notice that when i reload the aircraft, the configuration settings do not get saved. I read in the intro manual that the defenition file should save all of this information such as HUGS equiped, eyebrow windows, etc. along with sim specific such as "show actual throttle in blue" are not saved upon reloading the aircraft. IS this done automatically or do i need to save somehow so the settings for each livery are always there when I start a new flight. I also was not 100% clear from the manual on exactly how the defintion file and such works. Maybe someone can better explain it for me? Thanks, and what a fantastic aircraft this is. David A.