Sandbox is a copy of your application.  Think of it as a ‘playground’ where you build and make changes to your application without interrupting your production environment. After making changes in the sandbox environment, you review your changes, and you are satisfied with the changes, you will want to move all the changes up to the next level of environment. The process of moving the changes to the next level of environment is called ‘Merging’. Every time you make a change to your application, you will want to merge your changes to the next level of environment to keep your application in sync with your sandbox environment. 

Below are the steps to merge changes in a sandbox up to the next level: 

1. Click the View merge plan icon.
   
2. Review your changes to merge as shown on the screenshot.
   
3. Click the Merge changes button on the top left-hand corner of the application.
   
4. Fill in a Title and Description and ensure that your title and description is relevant to the changes that you are merging.
   
5. Click the Merge changes button.

Note: You can rollback changes but only to the last merge by clicking the three dots icon on your application and selecting Rollback.

Click the rollback button on the rollback overview page and click Rollback changes. 

For more information about development best practices see Best Practices for the Software Development Lifecycle (SDLC) in Betty Blocks.