You can now create Counterbore, Countersink and Straight slots directly from HoleWizard starting 2014 version of SolidWorks. Also as shown below you can see there is a better graphical representation of the type of holes in HoleWizard property manager.
1. As shown above we select the Counterbore slot for Hole type, ANSI Metric for Standard and Hex Bolt – ANSI B188.8.131.52M for type.
2. Now as shown below we pick M6 for Size, Normal for Fit, 40mm as Slot Length and Through All for End condition.
Now we switch to Positions tab and place the slot on the top face. The slot comes with a centerline which can be used to place relations and dimensions as shown below.
Not only can we place the slot horizontal or vertical but also at an angle as shown below.
Below is the final result we get for a Counterbore Slot shown in Isometric and Top view.