How to: Delete a Job Category (SQL Server Management Studio)
This topic describes how to delete a Microsoft SQL Server Agent job category that you have created. When you delete a user-defined job category, SQL Server Agent prompts you to reassign the jobs that are assigned to it to another job category. You can only delete user-defined job categories.
To delete a job category
In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance.
Expand SQL Server Agent, right-click Jobs, and then select Manage Job Categories.
In the Manage Job Categories dialog box, select the job category to delete.