You can cancel multiple manual and reversing journals using the Create Canceling Journals button in the Journals list view.
To cancel multiple journals:
You can cancel journals individually as explained in Creating a Canceling Journal. The Create Canceling Journals button simply lets you cancel multiple journals at once.
Related Concepts
About Currency Overrides on Journals
Related Tasks
Analysis and Tax Details on a Journal
Overriding Currency Values and Rates on a Journal
Posting Multiple Documents with OneTouch
Reference