Hi, all - I asked about this a while back and didn't get an answer, so thought I'd report in case this was confusing to someone other than me. Adding a sub-list is like adding 11 new topics if everyone on the super-list is subscribed to the sub-list. When posting, the sub-list is invisible to members. A member must only send a topic message to the super-list address, and it's received by those subscribed to that topic, whether the topic is on the super-list or on the sub-list. To put it another way, a message sent to the super-list address is examined for both super-list and sub-list topics. So, by adding a sub-list to my list, I gave it a total of 22 different topics. Pretty neat. Jilla