When may a motion be amended Is this a matter of procedural right or procedural discretion?

A motion may be amended at any time before it is decided, but this is typically subject to the court's discretion rather than a matter of procedural right. Courts generally allow amendments to ensure that all relevant issues are addressed and to promote justice, but they may deny amendments if they would cause undue delay or prejudice to the opposing party. The specific rules governing amendments can vary by jurisdiction and the type of motion involved.