Any modification or supplement to a pleading shall be deemed an amendment to the pleading, and shall comply with the particular requirements of content and form for the type of pleading so amended. Upon its own motion or upon motion duly filed by a party of record, the Commission may for good cause decline to permit, or may strike in whole or in part, any amendment. No amendment to a pleading may be filed within ten (10) days prior to the commencement of or during a hearing unless directed or permitted by the Commission or presiding officer after opportunity for all parties of record to be heard thereon.
S.C. Code Regs. § 103-828