REAL %Round(
   REAL in Arg1, 
   REAL in Arg2
 )

%Round(123.123,0.01)    ; returns 123.12
 
 %Round(123.123,10.0)    ; returns 120.0
 
 %Round(123.123,5.0)     ; returns 125.0
 
 %Round(123.123,0.2)     ; returns 123.2