I looks like.
Huntgroup 1
Name : Pickup1
number : 101
members : extn 201,202,203
Create a button or a user/restrictions shortcode
like Sc : #8
Number : 101
action : call pick up members
So you can pickup a call only for you group.
Then make a next one.
Huntgroup 2
Name : Pickup2
number : 102
members : extn 204,205,206
Create a button or a user/restrictions shortcode
like Sc : #8
Number : 102
action : call pick up members
and you can go on.
Greets Peter