Hi Joris,
I got it that we dont have any option to select the baseline.
I got that only models created first will go as the baseline.(but)
to cross check my results I tried creating a new model wih cus layer and customized an object compare with baseline is ( application suite as the baseline)
now after that i created a new model with SLN layer and while trying to customize the object I dint see the changes which I made in Cus layer