Is there something more efficient than EXISTS statement?

Hi All,
I have this query:
select
waco,
ltrim(rtrim(wammcu)) as wammcu,
wadoco,
walitm,
wadl01,
case
when wastrx = 0
then null
else
proddta.JulianToDate(wastrx)
end
AS wastrx,
wauom,
cast(wasoqs / 10000 as numeric (15,4)) as wasoqs,
cast(wasocn / 10000 as numeric (15,4)) as wasocn,
--THIS IS THE PART TO OPTIMIZIE
(select
sum(cast(glaa / 100 as numeric (15,2)))
from
proddta.f0911
where
glkco=waco and
glco =waco and
gldct='IV' and
glsblt = 'W' and
glsbl = right(replicate('0',8) + CONVERT(varchar,CONVERT(int,wadoco)),8) and
exists
(select * from proddta.f4095
where
mlanum in (3220,3260,3270,3280) and
mlco=glco and
mldcto=wadcto and
mldct=gldct and
mlcost='A1' and
mlobj=globj)) as A1_Account
--END OF THE PART TO OPTIMIZE
from
proddta.f4801
where
waco='00010' and
wadcto='WO' and
wasrst='99' and
wastrx >= 114001
and exists
select
from
proddta.f0911
where
glkco=waco and
glco =waco and
gldct='IV' and
glsblt = 'W' and
glsbl = right(replicate('0',8) + CONVERT(varchar,CONVERT(int,wadoco)),8) and
gldgj between 114001 and 114031
It takes a very long time to execute, my T-SQL is almost rusted, is there a way to improve the query with new costruct T-SQL has?

This is the query plan:
StmtText
|--Compute Scalar(DEFINE:([Expr1008]=CASE WHEN [JDE_PROD].[PRODDTA].[F4801].[WASTRX]=(0.) THEN NULL ELSE [JDE_PROD].[PRODDTA].[JulianToDate](CONVERT_IMPLICIT(int,[JDE_PROD].[PRODDTA].[F4801].[WASTRX],0)) END, [Expr1020]=[Expr1018]))
|--Nested Loops(Inner Join, OUTER REFERENCES:([JDE_PROD].[PRODDTA].[F4801].[WADCTO], [JDE_PROD].[PRODDTA].[F4801].[WADOCO], [JDE_PROD].[PRODDTA].[F4801].[WACO]))
|--Hash Match(Right Semi Join, HASH:([JDE_PROD].[PRODDTA].[F0911].[GLSBL])=([Expr1021]), RESIDUAL:([JDE_PROD].[PRODDTA].[F0911].[GLSBL]=[Expr1021]))
| |--Clustered Index Seek(OBJECT:([JDE_PROD].[PRODDTA].[F0911].[F0911_PK]), SEEK:([JDE_PROD].[PRODDTA].[F0911].[GLDCT]=N'IV'), WHERE:([JDE_PROD].[PRODDTA].[F0911].[GLDGJ]>=(114001.) AND [JDE_PROD].[PRODDTA].[F0911].[GLDGJ]<=(114031.)
AND [JDE_PROD].[PRODDTA].[F0911].[GLKCO]=N'00010' AND [JDE_PROD].[PRODDTA].[F0911].[GLCO]=N'00010' AND [JDE_PROD].[PRODDTA].[F0911].[GLSBLT]=N'W') ORDERED FORWARD)
| |--Compute Scalar(DEFINE:([Expr1007]=ltrim(rtrim([JDE_PROD].[PRODDTA].[F4801].[WAMMCU])), [Expr1009]=CONVERT(numeric(15,4),[JDE_PROD].[PRODDTA].[F4801].[WASOQS]/(1.000000000000000e+004),0), [Expr1010]=CONVERT(numeric(15,4),[JDE_PROD].[PRODDTA].[F4801].[WASOCN]/(1.000000000000000e+004),0),
[Expr1021]=CONVERT_IMPLICIT(nvarchar(8),right('00000000'+CONVERT(varchar(30),CONVERT(int,[JDE_PROD].[PRODDTA].[F4801].[WADOCO],0),0),(8)),0)))
| |--Clustered Index Scan(OBJECT:([JDE_PROD].[PRODDTA].[F4801].[F4801_PK]), WHERE:([JDE_PROD].[PRODDTA].[F4801].[WASTRX]>=(114001.) AND [JDE_PROD].[PRODDTA].[F4801].[WACO]=N'00010' AND
[JDE_PROD].[PRODDTA].[F4801].[WADCTO]=N'WO' AND [JDE_PROD].[PRODDTA].[F4801].[WASRST]=N'99'))
|--Compute Scalar(DEFINE:([Expr1018]=CASE WHEN [Expr1031]=(0) THEN NULL ELSE [Expr1032] END))
|--Stream Aggregate(DEFINE:([Expr1031]=COUNT_BIG([Expr1022]), [Expr1032]=SUM([Expr1022])))
|--Hash Match(Right Semi Join, HASH:([JDE_PROD].[PRODDTA].[F4095].[MLOBJ])=([JDE_PROD].[PRODDTA].[F0911].[GLOBJ]), RESIDUAL:([JDE_PROD].[PRODDTA].[F4095].[MLOBJ]=[JDE_PROD].[PRODDTA].[F0911].[GLOBJ]))
|--Clustered Index Seek(OBJECT:([JDE_PROD].[PRODDTA].[F4095].[F4095_PK]), SEEK:([JDE_PROD].[PRODDTA].[F4095].[MLANUM]=(3.220000000000000e+003) AND [JDE_PROD].[PRODDTA].[F4095].[MLCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO]
AND [JDE_PROD].[PRODDTA].[F4095].[MLDCTO]=[JDE_PROD].[PRODDTA].[F4801].[WADCTO] AND [JDE_PROD].[PRODDTA].[F4095].[MLDCT]=N'IV' OR [JDE_PROD].[PRODDTA].[F4095].[MLANUM]=(3.260000000000000e+003) AND [JDE_PROD].[PRODDTA].[F4095].[MLCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO]
AND [JDE_PROD].[PRODDTA].[F4095].[MLDCTO]=[JDE_PROD].[PRODDTA].[F4801].[WADCTO] AND [JDE_PROD].[PRODDTA].[F4095].[MLDCT]=N'IV' OR [JDE_PROD].[PRODDTA].[F4095].[MLANUM]=(3.270000000000000e+003) AND [JDE_PROD].[PRODDTA].[F4095].[MLCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO]
AND [JDE_PROD].[PRODDTA].[F4095].[MLDCTO]=[JDE_PROD].[PRODDTA].[F4801].[WADCTO] AND [JDE_PROD].[PRODDTA].[F4095].[MLDCT]=N'IV' OR [JDE_PROD].[PRODDTA].[F4095].[MLANUM]=(3.280000000000000e+003) AND [JDE_PROD].[PRODDTA].[F4095].[MLCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO]
AND [JDE_PROD].[PRODDTA].[F4095].[MLDCTO]=[JDE_PROD].[PRODDTA].[F4801].[WADCTO] AND [JDE_PROD].[PRODDTA].[F4095].[MLDCT]=N'IV'), WHERE:([JDE_PROD].[PRODDTA].[F4095].[MLCOST]=N'A1') ORDERED FORWARD)
|--Index Spool(SEEK:([JDE_PROD].[PRODDTA].[F0911].[GLKCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO] AND [JDE_PROD].[PRODDTA].[F0911].[GLCO]=[JDE_PROD].[PRODDTA].[F4801].[WACO]
AND [JDE_PROD].[PRODDTA].[F0911].[GLSBL]=CONVERT_IMPLICIT(nvarchar(8),right('00000000'+CONVERT(varchar(30),CONVERT(int,[JDE_PROD].[PRODDTA].[F4801].[WADOCO],0),0),(8)),0) AND [JDE_PROD].[PRODDTA].[F0911].[GLDCT]=N'IV' AND [JDE_PROD].[PRODDTA].[F0911].[GLSBLT]=N'W'))
|--Compute Scalar(DEFINE:([Expr1022]=CONVERT(numeric(15,2),[JDE_PROD].[PRODDTA].[F0911].[GLAA]/(1.000000000000000e+002),0)))
|--Clustered Index Scan(OBJECT:([JDE_PROD].[PRODDTA].[F0911].[F0911_PK]))
it returns 1734 rows, the tables queried contain milions of roiw

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