I couldn't find any command that would allow me to group and move clips together in multitrack view. When I added a section onto a clip, I had to manually move each succeeding clip in the session over. This was a major hassle -- what happened to the command+G command for grouping?
The clip group functionality available in Audition 3 was not ported to the new version in time for this release. You can select multiple clips (by holding CMD while clicking on each clip or by dragging to encompass several clips in a selection) and adjust their position or properties as a group, but at this time, the relationship is not permanent and disappears when a new selection is made. This feature remains high on the priority list for the next release of Audition.