Hi,
First, when you write "extended ACL", do you mean "Advanced ACL"?
Anyways I'd take a look at one of the ACL and QoS Configuration Guide , in this case I've just picked the HPE 5940.
It has a pretty good explanation and overview, and tells you how to create them.
ACL's have many uses, and the guide also shows a few cases of how you apply the ACL to a certain task.
Regards