WITH T AS (
SELECT 1000 AS BOX_CONT , 450 AS BOX_PACKAGE  FROM DUAL
)

SELECT CASE WHEN (BOX_CONT / 450 ) > LEVEL THEN BOX_PACKAGE
            ELSE  MOD( BOX_CONT , BOX_PACKAGE )
       END
  FROM T CONNECT BY LEVEL <= ( SELECT CEIL(BOX_CONT / BOX_PACKAGE) FROM T )

SELECT tot
     , box
     , LEVEL lv
     , LEAST(box, tot - box * (LEVEL - 1)) cnt
  FROM (SELECT 1000 tot, 450 box FROM dual)
 CONNECT BY LEVEL <= CEIL(tot / box)
;