Calling A Stored Procedure On Multiple Records

I have a stored procedure on an SQL Server database which displays statistical data for a single record. The example below selects a user ID as a parameter and displays the user's name and the total amount of transactions he has made:
CREATE PROCEDURE dbo.GetUserStats @UserID BIGINT AS
DECLARE @TempTable TABLE
(
UserID BIGINT,
UserName VARCHAR(60),
TotalAmt FLOAT
)

INSERT INTO @TempTable (UserID, UserName, TotalAmt)
SELECT u.RecID, u.LastName + ', ' + u.FirstName,
(SELECT SUM(t.Amount) FROM Transactions t WHERE t.UserID = @UserID)
FROM Users u
WHERE u.RecID = @UserID

SELECT * FROM @TempTable
GO

So if I execute this amount entering a single ID, it returns a single row for that user:

UserID UserName TotalAmt
--------------------------
1 Doe, John 100.00


What I would like to do is create another stored procedure which calls this one for every user returned in a query, thus returning the same data for several users:

UserID UserName TotalAmt
--------------------------
1 Doe, John 100.00
2 Smith, Bob 123.45
3 Blow, Joe 150.55


Is there a way to re-use a stored procedure within another, based on the results of a query?