how can I create a custom event property?

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To create a custom event property in Mixpanel, you can follow these steps: 1. Click the plus button to the right of the search bar in your Mixpanel project. 2. Select "Event Property" or "User Property" to open the property builder. 3. Give your property a name (optional). 4. Click into the formula bar to start defining your custom property.If you're new to this feature, Mixpanel recommends starting with one of their examples. You can click the "Insert Example" drop-down to populate the box with a use-case specific custom property.When writing your formula, you can use Ctrl + Space to see a list of available functions and their descriptions. Clicking the period (.) key allows you to search for event or user profile properties to add to the formula.By default, custom properties are local to the report when you select "Apply". If you want to save the custom property permanently for use in other reports and make it available to other project members, click "Save".It's worth noting that the formula used to compose your custom property can't be longer than 20,000 characters.For more detailed information, you can refer to the Mixpanel documentation on creating custom properties.

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