AtlasPower

Hi, I am following this post and I think this is what I need. I have solar sites that have been operating for 3-4 years... So I have reliable data. In order to calibrate my PVsyst model I would like to set up a variant with the exact details of my existing site(s). From there, I calibrate the PVsyst model to the actual output of my system. Now, when I want to use the same inverter/Module/Racking combination, all I need to do is use that variant as a base and modify the site location and Module/Rack/Inverter quantities to derive a very accurate simulation... However, at this point I am having a hard time doing this in PV Syst... How would I accomplish this?