Criar a Trigger no SQL para Numerar o PsId.
Abrir o SQL, selecionar o banco do Cliente e New Query e rodar o UPDATE abaixo.
CREATE TRIGGER tr_sales ON PROSER
after INSERT
AS
BEGIN
update PROSER
set PsId = (Select Coalesce(Max(PsId), 0) + 1 from PROSER)
from Proser
where PsCdg = (select top 1 i.PsCdg from inserted i)
END
Numerar os Produtos existentes
UPDATE PROSER
SET PROSER.PsID = x.NewPsId
FROM (
SELECT ROW_NUMBER() OVER (ORDER BY PSCDG) AS NewPsId, PsCdg
FROM PROSER V
) x
WHERE PROSER.PsCdg = x.PsCdg