Basically, you need to write something like:
CREATE PROCEDURE dbo.CleanupTableA (@CleanupDays INT)
AS BEGIN
DELETE FROM A.Fullimport
WHERE DATEDIFF(DAY, SomeDateField, GETDATE()) > @CleanupDays
END
- - , , .
DATEDIFF - . , ( , , ..). , , DATEDIFF , @CleanupDays, .
, ... ...