Hi Bobby,
What version of SSAS are you using? Haven't used cell calcs in yearrrrrrrrrsssssssssss
If you are using 2005+ then you could try
SCOPE([Income_Statement].[Account List].&[464]); --not sure I included everything you wanted
FORMAT_STRING(This) = "#,##0.00 %;-#,##0.00 %";
END SCOPE;
Mack