Display each quarters record in a row

Question

user aske me if I can display each quarters records in a separate row in the same report. will this possible without using PL/SqL
here is the desired out put.
in this case the user select  quarter 1-3 the year is 2011 and they can not select more than one year at a time of running report.
If possible i would like to give the user to select any quarter they want when they run the reprot. please give me a clue how this can be done.
PROJECTAWARDED     AWARDEDDOLLARAMOUNT     NUMBEROFBIDDERS     AVERAGENUMBEROFBIDDER          
30     56,552,584     116     4          
96     196,470,119     329     3          
71     174,899,055     278     4          
197     427,921,758     723     11          
  SELECT DISTINCT
         COUNT (P.CPROJNUM) ProjectAwarded,
         SUM (MIN (c.calcbtot)) AwardedDollarAmount,
         SUM (COUNT (C.VENDOR)) NumberOfBidders,
         (SUM (COUNT (C.VENDOR)) / (COUNT (P.CPROJNUM))) AverageNumberOfBidder
    FROM BIDDERS C,
         BIDLET B,
         LETPROP L,
         PROPOSAL P
   WHERE     C.LETTING = B.LETTING
         AND P.CONTID = L.LCONTID
         AND C.LETTING = L.LETTING
         AND C.CALL = L.CALL
         AND l.lcontid IN
                (SELECT lcontid
                   FROM letprop c, PROPOSAL d
                  WHERE     datestat IS NOT NULL
                        AND UPPER (letstat) <> 'R'
                        AND UPPER (letstat) <> 'B'
                        AND TRIM (UPPER (TIMELET)) = TRIM ('9:30 A.M.')
                        AND c.LCONTID = d.CONTID)                           
                        AND B.DATELET >= ADD_MONTHS(TRUNC(TO_DATE(:year,'YYYY'),'YYYY'),(:quarter - 1) * 3)
                        AND B.DATELET < ADD_MONTHS(TRUNC(TO_DATE(:year,'YYYY'),'YYYY'),:quarter * 3)   
GROUP BY l.call

Answer 1

SELECT DISTINCT
         COUNT (P.CPROJNUM) ProjectAwarded,
         SUM (MIN (c.calcbtot)) AwardedDollarAmount,
         TRUNC (TO_CHAR(B.DATELET, 'Q'))  ,------------------------Added this line and now it gives me an error ORA-00937: not a single-group group function
  ----I added the field in the group by clasue.
         SUM (COUNT (C.VENDOR)) NumberOfBidders,
         (SUM (COUNT (C.VENDOR)) / (COUNT (P.CPROJNUM))) AverageNumberOfBidder
    FROM BIDDERS C,
         BIDLET B,
         LETPROP L,
         PROPOSAL P
   WHERE     C.LETTING = B.LETTING
         AND P.CONTID = L.LCONTID
         AND C.LETTING = L.LETTING
         AND C.CALL = L.CALL
         AND l.lcontid IN
                (SELECT lcontid
                   FROM letprop c, PROPOSAL d
                  WHERE     datestat IS NOT NULL
                        AND UPPER (letstat) <> 'R'
                        AND UPPER (letstat) <> 'B'
                        AND TRIM (UPPER (TIMELET)) = TRIM ('9:30 A.M.')
                        AND c.LCONTID = d.CONTID)
         AND B.DATELET >=
                ADD_MONTHS (TRUNC(TO_DATE (:year, 'YYYY'), 'YYYY'),
                            (:from_quarter - 1) * 3)
         AND B.DATELET <
                ADD_MONTHS (TRUNC(TO_DATE (:year, 'YYYY'), 'YYYY'),
                            :to_quarter * 3)
GROUP BY  TRUNC(TO_CHAR (B.DATELET, 'Q')), l.call