SQL - grouping some rows as a single row but not others - grouping

Question

I have a table containing the following fields:
Location, WeekEnded and SalesOrder
I would like to sum by Location but there are several locations that only have a small number of orders that I would like to Group Together as a single location, I just cannot seem to get the code correct.
Curent Results
Location A 55
Location B 66
Location C 1
etc 11
What I would like is
Location A 55
Location B 66
Location C-Z 12
Code at the moment is
SELECT
Location,
WeekEnd,
sum(SOCount) as 'Sales Orders'
FROM SalesOrderHist
GROUP BY
Location,
WeekEnd
Anyone that can help I would be forever grateful.

Answer 1

Use CASE in your GROUP BY clause

Answer 2

Final code, in case this may help someone. The code contained quite a bit more so I have narrowed it down to include just the important stuff. I am a bit new to SQL so there may be a more effective way but this worked for me.
SELECT
lname as Location,
WeekStart as 'Week Start',
SOCount
FROM
(
SELECT
WeekStart,
SOCount,
CASE
when cast(lname as varchar(40)) in ('Location A') then 'Location A'
when cast(lname as varchar(40)) in ('Location B') then 'Location B'
when cast(lname as varchar(40)) = 'Location C' then 'Location C'
when cast(lname as varchar(40)) not in ('Location A','Location B','Location C') then 'OTHER'
else cast(lname as varchar(40))
end as lname
FROM
BDO_salesorderhist_pickeddate2
GROUP BY
lname
) d
GROUP BY
lname