You may observe that you are not able to delete backup jobs in Backup Exec 2012. As shown in the screenshot below the DELETE option will be shown and grayed out.
This is due to the fact that the view that is selected on top is LIST view which will not allow to delete the jobs.
To delete any job change the view to TREE view and then right click on the job and observe that the “Delete” option is available as shown and screenshot below. If the delete option still shows as grayed out then refresh the GUI or close and reopen it once.
Also please note that even in TREE view you cannot delete the individual stages but will have to delete the entire backup. To delete the individual stages you will have to Edit the job and remove the individual stage.
Hope this helps !!!