(a) Amendments and supplemental pleadings. At any time prior to the issuance of the final decision, the parties may, by unanimous express written consent, amend or supplement the pleadings. Supplemental pleadings may set forth transactions or occurrences or events which have happened since the date of the pleadings to be amended or supplemented, and which are relevant to any of the issues involved.

(b) Motions. Except as specifically permitted by rule in this subpart, motions, other than discovery-related motions and motions relating to procedural orders, shall be prohibited. Motions for procedural orders, including motions for extension of time, may be acted upon at any time.