The Hole by Boundary tool allows you to create holes in regions when you are in the process of creating a new model or adding to an existing model. To access this tool, click 
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The Hole by Boundary command is used to define an area to remove from a part surface by the curves that you select.
Dialog elements
- Select region
- Allows you to select the region in which you will create a hole.
- Select curves
- Allows you to select the curves that define the hole you wish to create.
- Enable automatic search for connected curves
- When this check box is selected, all curves that are connected to the selected curve are automatically added to the selection.