Hey guys

I'm adding a 100 amp sub panel for my basement shop. Also need some extra breakers for the attic addition.

I plan on removing the lower two circuits from the main panel and putting the 100 amp breaker there. The sub panel will be mounted immediately next to the main panel.

Sub panel will be fed by 2 AWG wire.

Question is how do I attach the Nuetral? The sub panel will be grounded to water service (same as main panel).

First Pic is main panel