Thank you for your prompt response. I actually don't ever want to directly add contacts to the master list. I just want it to exist to help lessen the amount of clicking when I am on the screen where I select the recipients of an email (where you select the timing of the send, etc). Since I have so many lists, scrolling through them all and selecting the ones I want becomes time-consuming when scheduling weeks of emails campaigns at a time (and also the more lists I have to select the greater the chance I might select the wrong list...and some of my list have 50,000+ contacts). If I merge the contacts from list A, B, C, and D into "MASTER"...and a users goes onto my website and chooses to opt into List A (which gets sent to CC via my API integration)...will that user also be added to the list "MASTER"? Or is merging contacts not dynamic and only a one time merge. Here's a quick example I can think of: List: A: person1@gmail.com B: person2@gmail.com C: person3@gmail.com 😧 person4@gmail.com Merge the lists into MASTER MASTER: person1@gmail.com, person2@gmail.com, person3@gmail.com, person4@gmail.com A new users goes onto my site and requests to be added to list A, so now: A: person1@gmail.com, NEWperson@gmail.com Does the list MASTER now consist of: person1@gmail.com, person2@gmail.com, person3@gmail.com, person4@gmail.com, NEWperson@gmail.com Thanks again for your help!
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