How to make chocolate croissant (pain au chocolat)

Pain au chocolat 🍫🥐
Full process of making pain au chocolat from the beginning to the end plus the recipe
the recipe is: 8,4kg flour 4,45kg water 1,2kg sugar 160g salt 400g milk powder 600g butter 200g yeast 840g sourdough
This make 5 blocks of croissants which each block you add 1kg of butter for the lamination