Use the Combine tool to split solids. Surfaces can be split by solids, planes, and other surfaces.
To split a surface by a solid or plane
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Select the Combine tool
from the Intersect ribbon group.
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Click the surface you want to cut.
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Click the solid or plane you want to cut the surface with.
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Mouse over the surface to see the regions created by the cut.
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Click the region you want to delete.
To split a surface by another surface
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Select the Combine tool
from the Intersect ribbon group.
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Click the surface you want to cut.
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Click the surface you want to cut the surface with.
You can Ctrl+click multiple surfaces that together completely intersect the target surface to fully cut the surface. You can box-select surfaces that only partially intersect the target surface to partially cut the surface.
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Mouse over the surface to see the regions created by the cut.
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Click the region you want to delete.