At present, we do not have the option to select a new thread in an existing sequence. You will have to do any new subject line email within a single sequence.

However, if you create an initial sequence with your first email and have steps under them, you can add another step to enroll in a separate sequence, you could then create a second sequence to have them auto-enroll in which it has the settings set to 'send follow-up emails as a reply in the same thread'. (There is a sequence step to automatically enroll the prospects from an existing sequence into another selected sequence).

Note: just be sure to set a delay before the first step in the new sequence.

To enroll in a new 'Sequence" step within an existing sequence/campaign is the solution at the moment, with the only caveat being that the stats will be broken up between each of your sequences.

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