Create An Array In A Result Field

I am between the "newbie" and "intermediate" stages of writing SQL code and I am wondering if there is a way to capture multiple results into one field so I can basically create a "set" for a unique identifier.  Here is few result samples I receive from this code I am using now.  
ReqNo              ProcID
7102005          1409
7102005          1796
7139003          1411
7139003          6097
7261030          1409
7261030          1796
7268303          3998
7268303          4000
 
I would like to create a single row for each "ReqNo" and have a field that will an array of the  "ProcID" results I receive.  In other words, for the first "ReqNo" 7102005, can I create a field that will combine the 1409, 1796 into one field?  I am trying to capture an array of integers used for that "ReqNo" so I can use that as a unique identifier in a join for another table. 
 
So, ideally my result would be:
ReqNo             ProcSet
7102005          1409, 1796
7139003          1411, 6097
7261030          1409, 1796
7268303          3998, 4000
 
Is this possible?


declare
@startdate smalldatetime,
@enddate smalldatetime ,
@month int,
@year int
 
select
 @startdate = dateadd (dd, -7, getdate())
SELECT
@month = datepart (month, @startdate),
@year = datepart (year, @startdate)
SELECT
@startdate = convert (smalldatetime, convert(varchar(2), @month) + "/1/" + convert (varchar(4), @year))
 
select
@enddate = dateadd (dd, 1 , @startdate)
 
select distinct
pp_req_no as ReqNo,
pp_cproc_id_r as ProcID
 
from
risdb_rch08_stag..performed_procedure
(index pp_serv_time_r_ndx)
 
where
pp_service_time_r between @Startdate and @Enddate
and pp_status_v = 'CP'
and pp_rep_id > 0
 
order by
pp_req_no, pp_cproc_id_r