SQL -  Srting multiple merged queries

I'm trying to automate multiple reports into a single email/report that has multiple top 10 lists.  I'm able to merge the report and insert individual title lines. But I can't sort them properly. If I run the queries one at a time and sort/ ORDER By they come out properly. but the merged reports won't let me use a sort/Order by option.

The query below works but it shows the top 10 customers alphabetically not be descending value. if I add (ORDER BY sum (T1.[LineTotal]) desc) to the end I get errors. How can I get the 2 top 10 lists to sort differently.

SELECT cast (NULL as varchar),'Top 10 customers for 2015'

UNION all

SELECT top 10 sum (T1.[LineTotal]), T0.[CardName] FROM OINV T0  INNER JOIN INV1 T1 ON T0.[DocEntry] = T1.[DocEntry] WHERE T0.[DocDate] > '01/01/2015' GROUP BY T0.[CardName] 

union all

SELECT cast (NULL as varchar),'Top 10 customers for 2014'

UNION all

SELECT top 10 sum (T1.[LineTotal]), T0.[CardName] FROM OINV T0  INNER JOIN INV1 T1 ON T0.[DocEntry] = T1.[DocEntry] WHERE T0.[DocDate] between '01/01/2014' and '01/01/2015' GROUP BY T0.[CardName] 

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