Splice
From Wikanual
INTERDUBS splice
With the splice feature you can join multiple clips into a single one.
The clips will appear in the order selected.
You can choose to have the source clips hidden. The new clip will appear in the folder that you selected the clips from. Processing might take a little while.
You will get notified when the target folder will receive the newly created clip.
Splice works best when the the resolutions of the source clips are identical.
Usage
Splice can operate on the clips in the current folder.
1) select the clips in the desired order that they will appear in 2) when all clips are select choose the splice iconthat appears when you selected more than one clip 3) enter the name of the new clip and decide if the source clips should be hidden
The new clip will appear in the folder after a little while. The admin interface will notify you when finished.