I'm not sure it's possible with the currect report GUI in Process Manager.
However it IS possible to do this in SQL Server T-SQL. You can create a stored procedure that returns the data you wish based on variables passed. For example:
CREATE PROCEDURE sp_blah (
@name NVARCHAR(255)
)
AS
SELECT * FROM Document WHERE Name = @name
will create a stored procedure. You can execute it with whatever variables you like with the following:
exec sp_blah 'woot'