Something similar to treegrid in jqGrid?

It seems to me, that what you really try to implement is grouping of the data by subCategory . I strictly recommend you to look at the official demo page of jqGrid to see different possibilities which it can.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.