T-Sql Join

Hi Experts,
I have a report and I need to join  a table (planjoin) the relationship will be on the current month, current year, rectype and subproduct. however, the report also has date parameters. how do I join the table (planjoin) on the month and year (vreportData) without surpressing the prior years data?

--declare @start datetime
--declare @end datetime
--declare @energyorg int

SELECT vreportdatacurrentprior.extendedstandardcost,
       vreportdatacurrentprior.businessentity,
       vreportdatacurrentprior.product,
       vreportdatacurrentprior.site,
       vreportdatacurrentprior.subproduct,
       SUM(vreportdatacurrentprior.orderamount_lastyear)      AS [Prior Bookings],
       SUM(vreportdatacurrentprior.invoiceamount_lastyear)    AS [Prior Sales] ,
       SUM(vreportdatacurrentprior.orderamount_currentyear)   AS [Current Bookings],
       SUM(vreportdatacurrentprior.invoiceamount_currentyear) AS [Current Sales],
       exchangerates.exchangerate,
       energysites.energyorg,
       vreportdatacurrentprior.qty,
       energysites.sitenumber,
       MWD.Days AS monthworkingdays,
       WD.Days AS workingdays,
       vreportdatacurrentprior.transyear
FROM   vreportdatacurrentprior
CROSS JOIN (select count(*) days
                       from master..spt_values
                       where type='P'  -- series from 0-1024
                        and number between 0 and 60  -- max of 30 days from start
                        and month(number+GETDATE()-30) = month(GETDATE())  -- within start month
                        and (datepart(dw,GETDATE()-30 + number)+@@datefirst-2)%7+1 < 6) MWD
CROSS JOIN (select count(*) days
                       from master..spt_values
                       where type='P'  -- series from 0-1024
                        and number between 0 and @end-@start  -- range from start to end
                        and (datepart(dw,@start + number)+@@datefirst-2)%7+1 < 6) WD
INNER JOIN exchangerates ON MONTH(vreportdatacurrentprior.transdate) = exchangerates.xratemonth
    AND vreportdatacurrentprior.transyear = exchangerates.xrateyear
    AND vreportdatacurrentprior.currencycode = exchangerates.currency
INNER JOIN energysites ON vreportdatacurrentprior.site = energysites.sitenumber
INNER JOIN planjoin ON vreportdatacurrentprior.subproduct = planjoin.subproduct
WHERE  ( energysites.energyorg = @energyorg )
AND ( vreportdatacurrentprior.transdate BETWEEN @start AND @end
          OR vreportdatacurrentprior.transdate BETWEEN
             Dateadd(yy, -1, @start) AND Dateadd(yy, -1, @end) )
       AND ( vreportdatacurrentprior.businessentity = 'energy' )
GROUP  BY vreportdatacurrentprior.extendedstandardcost,
          vreportdatacurrentprior.businessentity,
          vreportdatacurrentprior.product,
          vreportdatacurrentprior.site,
          vreportdatacurrentprior.subproduct,
          vreportdatacurrentprior.transyear,
          exchangerates.exchangerate,
          energysites.energyorg,
          vreportdatacurrentprior.qty,
          energysites.sitenumber,
          vreportdatacurrentprior.transdate
ORDER  BY vreportdatacurrentprior.transdate DESC

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