Hi Mala, re: filleting - there's a few different things going on there. One is that your object is made up of several separate surfaces, you need to join those together for the filleter to be able to do anything on those edges. You can't fillet a "naked edge", meaning one that is not joined between 2 faces.

Then the other thing is you don't want to have things like faces that are part of the same plane to be diced up into pieces, you need to make one large plane for those spots instead of having fragmented faces. I'm referring to these areas here:



The other thing that I did is to make this spot be a revolved surface that intersects with these planes rather than having it be built by Network which makes for some awkward shaping in it:





So try with the attached version it should fillet better:





- Michael