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Select a surface.
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In the Type box, select Constant and specify a Distance.
In case of constructions on top, the Constant and Variable options are not available for subsequent edition, as updates cannot be guaranteed to be free of errors.
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Click Apply.
- Manipulate the offset distance drawing the handle at the end of the manipulator.
- Invert the offset direction by clicking onto the middle handle of the manipulator.
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Click OK.
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