w [HN11] The decision whether to allow substitution is discretionary. COUNSEL: James T. Patterson, Sr., Pro Se, Riverdale, Georgia, for Appellant. William N. Withrow, Jr., Tench C. Coxe, J. Kirk Quillian, Atlanta, Georgia, for Appellee. Joseph B. Haynes, Atlanta, Georgia, for Appellee. A. Vernon Carnahan; Daniel