How do I quickly duplicate a custom event?

The knowledge sources don't provide a direct "duplicate" action specifically for custom events. However, here's what is documented:

If your goal is to create a new custom event based on an existing one, the recommended approach is to:

There is no dedicated one-click "duplicate" button for custom events in Lexicon based on the available documentation. If you need this functionality, you may want to reach out to Mixpanel Support for further guidance.

kapa.ai I've got complex custom events (ie Asset used) that include a lot of other events (about 20+) but need differen versions depending on context - how do I solve this quickly

A few things to note upfront: a Custom Event definition supports up to 25 events maximum, so if you're already near that limit, you'll need to be mindful of that constraint. [Custom Events] For managing multiple context-specific versions of a complex custom event, here are your practical options based on the documentation:

Rather than creating entirely separate custom events, create one base custom event (e.g., "Asset Used") and apply inline property filters when using it in a report to narrow it down to the specific context you need. This avoids duplication. [Custom Events]

Create distinct custom events for each context (e.g., "Asset Used - Dashboard", "Asset Used - Mobile"), each containing the relevant subset of your ~20 events. You can manage and edit all of these from Lexicon → Custom Events. [Custom Events]

If you need context-specific versions within Insights reports only, Simple Behaviors are easier to edit on the fly directly from the query builder, without cluttering your global custom events list. Use Custom Events only when you need the definition available across Funnels, Flows, Retention, or cohorts. [Custom Events]

Recommended approach: Use Simple Behaviors for quick, report-level variants and reserve Custom Events for the canonical versions needed across the platform. Unfortunately, there is no one-click duplication for custom events, so building variants requires manual recreation — keeping your event count under the 25-event cap per definition.