Basic config question:
If I have add an initial access-list rule (no others are defined yet):
access-list outbound permit icmp any any
access-group outbound in interface inside
AND then I want to add another access-list rule:
access-list outbound permit tcp 192.168.0.0 255.255.255.0 any eq www
Do I need to specicy the access-group command with each subsequent access-list rule I add to the same ID?
no.you do not need to add access-g command for each access-list statement with the same id.
access-g applies the access-list on an interface.
create n number of access-lists with the name of outbound.
create one access-g command with the same id and apply that on any of the interface.
remember,you can apply an access-list " let's say " outbound " on only one interface.