You can delete a SQL instance from the CommCell Console. When you delete an instance, the associated data is logically deleted and you can no longer recover that data.
Before You Begin
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Verify that there are no running or scheduled jobs, because all the scheduled jobs and job histories pertaining to any of the levels within the deleted instance are deleted. 
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If a backup is in progress, either wait for the backup to complete or kill the backup job using the Job Controller. You can then delete the instance. 
Procedure
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From the CommCell Browser, click Client Computers > client > SQL Server. 
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Right-click theinstancethat you want to delete, point to All Tasks, and then click Delete. 
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In the Confirmation dialog box, click Yes. 
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In the Enter Confirmation Text dialog box, type the requested phrase, and then click OK.