We’ve introduced a powerful new filter option for segments — “Is in Segment”. This allows you to include or exclude users based on whether they already belong to another segment.
How to use it:
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Create a new segment.
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Under the Events / Actions Performed section, select “Is in Segment” from the People Who dropdown.
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In the Segment Type dropdown, choose whether to:
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Include users who are in another segment, or
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Exclude users who are in another segment.
- In the last dropdown, select one or more of your existing segments to use as the filter.

Example:
Let’s say you have an existing segment called "High-Value Customers" (users who have made purchases over $500).
You could create a new segment called "High-Value Customers Who Attended Webinar" by:
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Adding the "Attended Webinar" event, and
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Using Is in Segment → Include → High-Value Customers.

This way, the new segment will only include users who both attended the webinar and are part of your “High-Value Customers” segment.
This option is also available in query-based segments.
