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When you select an avail in the Log Editor, one of the things you can do from the right-click menu is edit the avail, whether or not there is a spot in the avail. .An avail is edited on the dialog above, which is much like the dialog used to define the avail in the first place. Changes made to this avail or AvailSet will apply to this use of the AvailSet on this log, and will not affect the AvailSet as used elsewhere.