Prior to assigning cables to drums, you have to associate your cables with a pulling area.
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In the Domain Explorer window, select and right click the cable that you want to associate with a pulling area.
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On the shortcut menu, select Properties.
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On the Cable Properties dialog, from the Pulling Areas list, select the pulling area that you want the selected cable to be associated with.
You can use the Pulling Areas dialog to add new pulling areas or edit existing.
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Select OK to save your changes and close the Cable Properties dialog.