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Sandboxes: Staging Environments for Customizing and Testing
Working with Custom Libraries

Working with Custom Libraries

Define new custom libraries, and edit existing custom libraries.

Required Editions

Available in: Lightning Experience
Available in: Professional, Enterprise, Unlimited, and Developer Editions with the Salesforce Data Mask add-on license.
Note
Note Data Mask & Seed and the Data Mask managed package share all custom libraries. Custom libraries created using either one of these apps are listed and available for use in the custom libraries page of the other app.
 
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Salesforce Help | Article