I don't have time to take pictures right now, but steps 2-5 are as if you creased the waterbomb along one angle bisector and open-sunk it.
The sink in 6 is a bit trickier, though, because of the interior edges. Just precrease it from where the sink starts, open the model from inside as much as you can without separating the edges, and push the point in. One edge will be wrapped around another.