Adding a Parameter to a built in Report

Question

Using SSRS, I cloned (using a simple save as command with a new name) the built in "Computers with a specific product" report and would like to add a parameter to filter the results by a device collection. This parameter exists in the
"Computers with specific software registered in Add Remove programs" report.
I am not familiar with SSRS and so editing this way is alien to me. I have only authored static SQL queries with no parameters in the past. Does anyone have any advice on how to get started? It appears I need to add a new data set for the collection
using an SQL query. Is this correct?

Answer 1

I was able to get what I needed. but I don't have the foggiest notion of where I got the informatin from. Here are the notes I took (YMMV):
Creating the Dataset
A dataset for all collections must be added. The parameter relies on this dataset to pull the list of collections. You can name it
All_Collections or something similar.
select distinct c.CollectionID, c.Name, c.CollectionType from v_Collection c
WHERE c.CollectionType = 2
order by c.Name
This returns all collection names; the
WHERE clause specifies computer collections only.
Adding the parameter
In the main query/dataset, create an inner join between the
v_R_System and
v_FullCollectionMembership views
using the ResourceID field.
Name the parameter
CollID.
Create a filter/WHERE statement what says CollectionID is @CollID, e.g.
WHERE  v_FullCollectionMembership.CollectionID = @ColID
This assumes the parameter added is named
CollID; if not, the value after the equals in the statement above should match the name of the parameter.
In the Where statement above, the GUI report building will insert N'variable'
(e.g. N'CollID') around the CollID value. This should be removed. If the query is created in the report builder GUI, you must switch it over to editing by text.
Note: What the N does is tell the SQL Server that the data which is being passed in is uni-code and not character data. When using only the Latin character set this is not really needed.
However if using characters which are not part of the basic Latin character set then the N is needed so that SQL knows that the data being given it is uni-code data.
Recommendation: Create all joins and filters using the GUI for the main query first. When done, edit the parameter as described in item b above
to enable use of the collection selection parameter.
Hope this helps!