Tree / Level Structure "From & To" Input

Havings read an earlier thread "Setting up Tree Structure", Forum Guru, JBeaucaire came up with a briliant solution which is exactly what I need but I require to allow for more levels. I have had only limited experience and am finding it difficult to follow methodology (seems to use autofilter) so as to adapt it.

Essentially I want to input input data with "from" & "to" nodes and generate a level structure. A spreadsheet is attached which shows input and output format. The borders and cell colours are not essential in output sheet but would like to end up with a similar tree structure which can be prettied up manually as shown.

The numer of input rows could be upto 250 with upto 9 levels.

If it is too difficult no problems.

Mike