Creating a total result set from a query

I am having an issue trying to come up with a solution to return a table with the following stored procedure and then at the bottom being able to have a table row that shows the totals.  Do I need to run a separate query for this...here is what I have:

Create PROCEDURE [dbo].[usp_me_totalquestion]
	  @startDate datetime = NULL
	, @ENDDate datetime = NULL
	, @userid int = -1
	, @groupByScript int = 0
	, @groupByAgent int = 0
	, @groupByDate int = 0
AS
set nocount on	

begin

DECLARE @sql VARCHAR(max)
DECLARE @where VARCHAR(200)
SELECT
--[AgentName] = (CASE WHEN @userid > 0 THEN FullName ELSE 0 END),
[scriptload] = count(*),
[scriptread] = sum(CASE WHEN ScriptRead > 0 THEN 1 ELSE 0 END),
[scriptreadpercent] = round(CASE WHEN count(*) = 0 THEN 0.00 ELSE (sum(CASE WHEN scriptread > 0 THEN 1 ELSE 0 END)/cASt(count(*) AS DECIMAL(6,2))) * 100 END,1),
[cancelled] = sum(CASE WHEN STATUS = 'F' THEN 1 ELSE 0 END),
[retained] = sum(CASE WHEN STATUS = 'S' THEN 1 ELSE 0 END)
FROM ccp_customer_retention_log r
inner join ccp_users u
ON r.id = u.id
WHERE r.insertdt between CAST(@startDate AS VARCHAR(15)) and CAST(@EndDate AS VARCHAR(15)) 
group by 
CASE
WHEN @GroupByScript = 1 THEN r.scriptID
WHEN @GroupByAgent = 1 THEN u.fullname