Sequence can be deleted by following any of these two methods :
    
Using Mouse :-
Using Menubar :-
  
Using Mouse :
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1> Select the Sequence that has to be deleted by clicking
left mouse button on it from the tree view.
   
2> Clicking right mouse button on it,a pop up menu comes,from where
if "Delete" menu item is selected then the Sequence gets deleted.
  
Using Menubar :
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1> Click on "File > Delete > Sequence" from the Menu bar.A window
appears with a title "Delete Sequence".
  
2> Select the sequence which is to be deleted from the Drop down
box.
  
3> Click on "Delete" button to delete the sequence. 
   
4> Click on "Cancel" button to cancel the proceeding and return 
to the OCM user interface.