1. Enter Sandboxes in the Quick Find box from Setup, then select Sandboxes.
2. Click on New Sandbox, or click Clone next to a completed sandbox.Note During the beta, some older sandboxes aren’t available for cloning. Unavailable source orgs don’t have a Clone link next to them.
3. Enter a name (10 characters or fewer) and description for the sandbox.We recommend that you choose a name that - Reflects the purpose of this sandbox, such as QA.Has only a few characters, because Salesforce appends the sandbox name to usernames on user records in the sandbox environment. Names with fewer characters make sandbox logins easier to type.
4. Reflects the purpose of this sandbox such as QA.
5. Has only a few characters, because Salesforce appends the sandbox name to usernames on user records in the sandbox environment.Names with fewer characters make sandbox logins easier to type.
6. From dropdown ,If you clicked New Sandbox, from the Create , select the name of the sandbox that you want to clone.Note During the beta, some older sandboxes aren’t available for cloning. Unavailable source orgs don’t appear in the Create From dropdown.
7. If you clicked Clone, confirm that the sandbox name selected in the Create From dropdown is the sandbox you want to use as your source org.
8. Make sure that the org you’re cloning has the license type that you want for your new sandbox. To use a different license type,choose a different source org from the Create From dropdown.
9. Click on Next.
10. To run scripts after each creation and refresh for this sandbox, specify an Apex class that extends the Sandbox Post Copy interface. The Apex class you specify must exist in your source org.
11. Click Create.Tip Avoid making changes in your source org while the sandbox copy occurs.