Is there any way to effect a change to all the bundles in a folder?

The particular change I am after are the user assignments. These were all manually added to their associated AD groups but were all applied with a Distribution Schedule (User Login) with 'Install Immediately after Distribution' ticked. ie the application will install when the user logs on. Since this was applied to all of the applications, anything the user is assigned to gets installed.

So is there any way to remove the Distribution Schedule for all of the bundles?