Just in case anyone has a similar problem to this, I'm sharing the solution that was provided by ScottPlecther with the help of a CTE. Once again many thanks to Scott, your a star!!!

;WITH cte_qtr_bals AS (

SELECT

DATEADD(QUARTER, DATEDIFF(QUARTER, 0, ORDER_DATE), 0) AS QTD_SD,

LDGRID,

SUM(ISNULL(T_AMT, 0) * CASE WHEN TDM = '0' THEN -1 ELSE 1 END) AS QTR_BAL

FROM LDGRTRN

WHERE LDGRID IN ('LDGR_ID1','LDGR_ID2','LDGR_ID3','LDGR_ID4')

GROUP BY DATEADD(QUARTER, DATEDIFF(QUARTER, 0, ORDER_DATE), 0), LDGRID

)

SELECT DATEADD(QUARTER, DATEDIFF(QUARTER, 0, L.ORDER_DATE), 0) AS QTD_SD,

A.LDGRID,

DATEPART(QUARTER, ORDER_DATE) QTR_#,

(DATEPART(YYYY, ORDER_DATE)) AS YR,

(SELECT SUM(QTR_BAL)

FROM cte_qtr_bals cqb

WHERE cqb.QTD_SD < DATEADD(QUARTER, DATEDIFF(QUARTER, 0, L.ORDER_DATE), 0)

AND cqb.LDGRID = L.LDGRID

) AS QTR_OPN_BAL

FROM LDGRACCTS A LEFT JOIN LDGRTRN L ON A.LDGRID = L.LDGRID

WHERE A.LDGRID IN ('LDGR_ID1','LDGR_ID2','LDGR_ID3','LDGR_ID4')

AND L.ORDER_DATE >= DATEADD(QUARTER, DATEDIFF(QUARTER, 0, @START_DATE), 0)

AND L.ORDER_DATE < DATEADD(QUARTER, DATEDIFF(QUARTER, 0, @END_DATE) + 1, 0)

GROUP BY DATEADD(QUARTER, DATEDIFF(QUARTER, 0, ORDER_DATE), 0),

A.LDGRID,

(DATEPART(YYYY, ORDER_DATE)),

DATEPART(QUARTER, ORDER_DATE)

ORDER BY QTD_SD,

LDGRID