I have an existing sql server 2008 r2 report that has a drop down menu where you pick only one item at a time. However, I would like to change this ssrs 2008 r2 drtop down menu so multiple items can be selected at one time. Thus can you tell me how I can change the existing drop down menu so multiple items can be selected at one time.
If this is an user-defined report then you have to change the code where the drop down menu is displayed. Check thsi http://msdn.microsoft.com/en-us/library/aa337396(v=sql.100).aspx link fyi.