tree structure output

I am not able to attach the file..

col1 col2 col3 col4
x a 1 i
x b 2 i
x b 2 j
y f 3 k
y c 5
y x a
y e e
z g 7
z h 7
z y 8
z x 8

You can use Data -> Group feature but it goes to only 5 levels down.
Try it.

I want to know if we can go more than 5 levels.

NYBoy