We don't have a built-in feature to automatically mark leads present in multiple lists, but we can suggest an efficient approach:
1. Use the "Lookup Single Row in Other Table" or "Lookup Multiple Rows in Other Table" feature to check if leads exist in another list.
2. Then, use the "Filter List of Objects" action to identify duplicates. Set the filter field to the lookup result.
This method allows you to identify leads present in multiple lists. If you're on an Explorer+ plan, you can also exclude people from searches within the people search feature.
Need more help? Just ask to talk to a person in this chat.
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Identifying Overlapping Leads in Multiple Lead Lists | Clay
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