1.Click Queries
2.Click Manage Queries
3.Select a category that you want to store this query in
4.Select New Query under the tasks menu
5.Name the query 
6.Set the Starting criteria to Base/All Constituents
7.Set the Data Return Type to Journal Entries
8.Under Criteria Matching select Match Each Critiera
9.Select Journal  from the Available Fields drop down menu and click on Transaction Order Items Discount
Mark the specific discount
10.Click Save and Preview