The following formula field removes alphabets

StringVar MyField;

StringVar Strip;

Strip:= “”;

MyField := {Command.xxx};

While Length(MyField) > 0

Do

(

If IsNumeric(Left(MyField,1))

Then Strip := Strip + Left(MyField,1)

Else

If (Left(MyField,1)=”-”)

Then Strip := Strip + Left(MyField, 1);

MyField:= Mid(MyField,2);

);

Strip;