Creating Spaces from Polylines
During the initial stages of a design, it may be easier to work with polylines instead of spaces. Use the Modify > Add/Clip/Intersect/Combine into Surface commands to modify the polylines to create the desired shapes. Once the polyline shapes are finalized, convert them into spaces to take advantage of the additional features that space objects provide, such as labels, area calculations, room finishes, and so on.
To convert polylines into spaces:
1.
2.
Select AEC > Space Planning > Create Spaces from Polys. The selected items are converted into spaces.
Another option is to draw a polyline and then select the Objects from Polyline command (see Creating Objects from Polylines and Creating Polylines).

Space Planning and Programming : Space Planning : Creating Spaces from Polylines

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