Pass variable to subreport

Question

I'm using SQL Server 2014 and Reporting Services and I've got a report containing a number of linked subreports. The main report I have will be different for each customer I produce the report for and will contain different text, but I need to pass a customerID
to the subreport in order to filter the following query:
SELECT V.vCenterName,
COUNT(DISTINCT M.VMName) *1.0/COUNT(DISTINCT M.Hostname) AS VMsPerHost
FROM
dbo.VMs M INNER JOIN dbo.vcenters V ON M.vCenterID = V.vCenterID
WHERE M.vCenterID LIKE V.vCenterID
GROUP BY V.vCenterName
ORDER BY VMsPerHost DESC
If I can declare a VARCHAR variable before the query and then pass the customerID from the main report to the subreport, I can filter the data by the specific customer only and do this for each main report. How would this be done though. I know there's an
option to work with parameters but I don't understand how it works.
Thanks in advance
Adam

Answer 1

Hi Adam,
create customerid parameter in sub-report.
In main report use subreport control and provide the subreport.
in subreport properties go to parameter section.set parameter value from your main report parameter which will give the customer id.
If you want to pass the value by dataset you can give the dataset field value.
Thanks
Prasad