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You'll have to use a note (in the annotations tab) If you're labeling the same thread frequently you can save out the note to use again. You could also create a custom property for the thread and link to the custom property in the notes.
If you don't know how to link to custom properties within a note, go to http://solidwize.com/drawings and click on the link titled "adding notes" for a quick video tutorial
thanks, i thought there was kind a like smart dimensions...