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Click in a field of an existing storey or work level to edit it.
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Right-click on an existing storey or work level to open the context menu.
Right-click on a level to open the following context menu:

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Select the desired action.
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For work levels, the Storey height field is deactivated. Work levels below a storey level are automatically marked with a negative sign.
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When converting storey levels to work levels, the value of the storey height is taken as the offset. Conversion in the other direction works in the same way.
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The storey and/or work levels are edited.
