How should I make the layout with sub headings - trees

[bymustym]

I am not able to figure out what would be the best design for showing something like this on html pageI haveCategory ------ \[code\]Catgeory\[/code\] can have many \[code\]Products\[/code\] and products have many \[code\]Features\[/code\].Now in every row I want to add , delete, edit buttons as well to update the data but i am not able to decide how would be the layout design of that things , so that it looks good.