>Hi,
>
>I am trying to write a code (in a .prg) that would change a SQL Server column size from numeric(3,0) to numeric(6,0). But I can't.
>Anyone can suggest a code to make such a column size change?
>
>TIA

What is wrong with integer?
As Tore said int is better than numeric(6,0)
Pure TSQL command:

IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE Table_NAME = 'YourTableName'
                                                     AND Column_Name = 'ColumnName'
                                                     AND Data_Type = 'int')
   BEGIN
      ALTER TABLE YoutTable ALTER COLUMN YourColumn int
   END

Keep in mind that if you have some constraints with this column you should remove them first and set them back again.