You must have already created a space folder using the Space Management > Space Folder 
command.
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Right-click any space node in the Space Hierarchy Explorer
to display the shortcut menu.
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Select New Space Folder to display the Space Folder Controls.
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Select a space folder to define the active parent system:
Click Space Folder > Select from Workspace
to display the Workspace tab on the Select Space Folder Dialog. Select a space folder, and then click OK.
Click Space Folder > Select from Model
to display the Model tab on the Select Space Folder Dialog. Select a space folder, and then click OK.
Click Select Parent System Interactively
, and then select a space folder from the Space Hierarchy Explorer .
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Type a name in the Name box.
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Create the space folder:
Click Finish
.
Click Finish and Modify
to create the space folder and make modifications. You can select additional objects,
or modify the current selection.
Click Finish and Repeat
to create multiple space folders quickly.