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Click Building parts …
The Building parts dialog opens.

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Click in a free line of the table or Add New Building Part to create a new building part.
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Enter the name of the new building part.
The new building part is created.

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Click Select in the row of the new building part.
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In the list that appears, deactivate the levels that do not belong to the current building part.

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Click outside the list to close it.
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Repeat the process for all other building parts and close the dialog with OK.
The building part is created and the levels are assigned. If you select a building part in the Building parts section, the corresponding storeys are displayed in the Storeys area.
