Use Freehand Hole 
to cut out holes within the selected fill area, by drawing outlines to define the holes.
This function only affects the currently selected fill area.
Shortcuts
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Freehand Create Tab, Enhance:
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Keys: Alt, R, H
Create a Freehand Hole in a Fill Area
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Select the area in which you want to cut the hole.
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Draw a line around the edge of the desired area for the hole.
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When the area is complete, lift the pen from the tablet (or release the mouse button). The area is closed with a straight line back to the start point.
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Continue to cut as many fill holes as desired.
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Right-click to deselect the function, or simply select another tool.
.It is recommended to draw back to the start point. However, you can also adjust the shape of the hole afterwards, if it is not the exact shape as desired.