multi light 1 switch each, and one switch for the all light
You could use smart switches and have a lot of versatility... but you can also do it with manual switches easy enough. 

At the first switch point, you have the "master switch". You bring in always-hot and neutral.  Pass through neutral, connect always-hot to the switch, and switched-hot to the other side of the switch.   

Then at the second switch point, you have 6 switches.  Switched-hot goes to each of the switches.  Then branch-switched-hot comes off the other side of the switch for each of the six branches.


Annnnnd... this is why there are 8 legal colors for hot wires. 

In this diagram, black=always hot, red=master-switched-hot, and all other colors are branch switched hots.  Grounds not shown because, enough.