Here is my current script:

```
select ih.DOC_NO as [Work Order]
, SUM(ih.C_DOC_TOTAL) as [Sales]
, case when ih.PARENT_DOCCATEGORY = 'S2' then a.cost
else b.Cost
end as [Cost]
from INV_HDR ih
outer apply
(
select sum(SUBTOTAL_cost) as Cost
from WO_HDR as A
where DOC_CATEGORY = 'S2'
and A.DOC_NO = ih.PARENT_DOC_NO
) as a
outer apply
(
select SUM(cost) as Cost
from INV_LINE as B
where PARENT_DOCCATEGORY = 'TK'
and b.DOC_NO = ih.DOC_NO
) as B
where ih.POST_STK_DATE > '2016-11-22' and ih.POST_STK_DATE < '2016-11-23'
group by ih.doc_no, a.Cost, b.Cost, ih.PARENT_DOCCATEGORY
order by ih.DOC_NO desc
```

A. I'm trying to make this script execute the quickest I can due to issues with Power BI auto-refresh so if this can be written more efficient, please give me your suggestions.

B. Sometimes, a Work Order has two lines, a line type 15 and line type 9. Sometimes, a Work Order has 4 lines, two line type 15 and two line type 9. When line type 15 Exists, I need to subtract the Cost from line type 9 from the Cost of line type 15......something like sum(c.cost)-sum(d.cost) where line type 15 is C and line type 9 is D. This statement will be first in my Case statement to see if a line type 15 Exists. If it does not exist, then we go to the next line in the case statement.

Anyway, thank you for your time.`Preformatted text`