subquery - SQL - How to subtract / add two or more sub queries (looking for a more proficient way) -

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I already know how to perform subtraction / addition either on two subqueries and then the result is a new column In the form, we have copied subqueries and placing them into brackets. 

  (Select IIF (BL.value1) Table 1 T1 INNER from Table 2 T2 ON T1.ID = T2.Table1ID where T2 .ID = TableMain.ID) - --- & Lt; Join subtraction (SELECT SUM (T5.Value2) from Table4 T4 to INNER Table6 T6 ON T4.ID = T6.Table4ID T6.ID = T7.Table6ID at INNER T6 ON as far as T7.FIeld IN (40))) [Net invoice value]

I would like to know whether this is the only easy way to use aliases?

Thanks in advance


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