path index and path mapper

Hi,

I merged many lists into one and ended up with this (each branch has a list of items inside)

{0;0}

{0;0;0}

{0;0;0;0}

{0;0;0;0;0}

{0;0;0;0;0;0}

the length may vary (more branches or less). How can I take them all and just order them in a neat tree? I thought using path mapper would solve it, but write this:

{path_index}(i)--->{0;path_index}(i)

and end up with just the branches as indexes under one branch

{0;0}

0

1

2

thanks.