Please find attached an example as requested. It starts from Row 77 to 82 which shows an order with its complete dept from Cut to Finish.
I have also place some text messages for each of the column to show which column and row are dependant to each other and all the column which are dependent i have coloured it yellow as pattern and blue for the fonts which will easily identify and to read.
I have also leave to formula for these rows so that we can see the calculation on the grid and the column used if we try to edit the formula. This will be easier to understand also i guess.