Update: Found what may be part of the answer in another post (how to "Include" other lists when sending a campaign).
"It is somehow, but it will create a merged list in the end, from all your selected list, and i am not sure that thsi is what you want, but in case it is, go to Backend -> Settings -> Customers -> Campaigns and look for "Send to multiple lists" and set it to Yes."
This allows me to send a broadcast to multiple lists so this one is solved.
My updated questions:
Q1: Excluding Lists.
How can i "Exclude" lists from a broadcast? (Example: I want to send broadcast to "List A"
excluding from it, all the subscribers from "List B" - subscribers that may have in common).
Q2: Sending to Multiple Lists - How Duplicate Subscribers are Treated?
Suppose that i include 3 lists for a campaign and the 3 lists have 1 email in common.
Will that person receive only one email right?
Thanks once again,