The existing feature is a blind hole, and has been created for you. The following page shows the different function windows that are associated with a counterbore, countersink, threaded hole, and clearance hole. All hole centers in a sketch will be auto-selected by the computer when the hole command is initiated. You will have to hold down the shift key to deselect the hole centers that you do not want. Work your way around the block in a clockwise direction initiating the hole function, selecting the appropriate hole center, and identifying the type of hole feature that is needed. The counterbore will have a major diameter of .75 inch that is recessed .25 inch. From there, its through hole will have a diameter of .375 inch. The countersink has a major diameter of .75 inch, with a taper of 83°. Its through hole has a diameter of .375 inch. The threaded through hole has a nominal diameter of .25 inch, and a 1/4-20 thread applied to its interior wall. The clearance hole goes through the disc, and has a diameter of .531 inch. Note: a shared sketch will not disappear after the first feature is created. 
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