I did some looking and I can't find any FRCP that deals with filing an amended motion. Rule 15 deals with amended pleadings (http://www.law.cornell.edu/rules/frcp/rule_15), but that's for complaints and answers - not motions.
Unless there is some local rule that provides a procedure to amend a motion, then there likely isn't one.
In my practice, if I've ever amended or supplemented a motion, I've just drafted and filed it with the court. Obviously, the opposing party will have time to respond to the amended motion, and if a hearing date has been set, it could be moved back because of the amended/supplemental filing, but I don't find anything that prohibits you from doing this.
thank you very much :)
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