To save your custom property for use in other reports, you can follow these steps:
1. After creating your custom property in a report, click the "Save" button instead of just "Apply".
2. When you select "Save", you'll have the option to add a description and choose whether to share the custom property.
3. To make the custom property available for other project members and usable in other reports, click "Save and Share".
This process is described in the Custom Properties documentation:
Custom properties are local to the report by default, when you select Apply. To save the custom property permanently for use in other reports and to make it usable by other project members, click Save. We recommend Apply-ing the custom property and using it in your local analysis first, before saving and sharing, to reduce clutter in the project.
When you create custom properties and select Save as Custom Property, your created custom property will be private by default. You can also add a description at this stage, so you and your colleagues can know what the custom property is for. You can also decide to save the custom property and share that custom property with specific colleagues, teams or the entire organization by clicking "Save and Share".
By following these steps, you can ensure that your custom property is saved and available for use across different reports in Mixpanel.
