You can try go through TamilSelvan's article in [here|https://wiki.sdn.sap.com/wiki/display/WDABAP/Organization%20Hierarchy%20in%20TREE%20structure%20as%20F4%20help]. I would however recommend you try analyze the standard component WDT_TREE instead of the article as Selvan has unfortunately missed out on documenting his task properly. He hasn't mentioned the various parameters he is passing as input to his methods because of which you would end up in syntax errors if you try to copy & paste the same code. You are better off trying to go through the standard component WDT_TREE.
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