>is it posible to Make Grid add only ie cannot edit exiting records ?

Make the grid ReadOnly, and have a command button to APPEND BLANK, set a flag that you're adding a record, and in the BeforeRowColChange, don't allow them to change rows if the Adding flag is on.

Have another button to save the changes and stop adding that also turns the adding flag off.

Or, simply have a ReadOnly grid, that uses another DataEntry form or page with textboxes and values to do that editing and adding. DE is much easier in controls than a grid.