The NetRadiantCustom shortcut to clip geometry is really easy - just hold CTRL and LEFT click to set Point 1. Then move your cursor to where you want to second point to create a line to "cut" the brush. Hitting enter will cut the piece away, holding CTRL and then enter will keep both.
Hand-Shaped Terrain
in Mapping
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What program are you using?
The NetRadiantCustom shortcut to clip geometry is really easy - just hold CTRL and LEFT click to set Point 1. Then move your cursor to where you want to second point to create a line to "cut" the brush. Hitting enter will cut the piece away, holding CTRL and then enter will keep both.
Those are the basics that should get you cutting!