It's better if you wach video.
Open Organizer - Publisher
In Publisher sets: New Publisher setFrom Layout Book side to right new Publisher set drag files
Now in Format, choose DWG for every single files and then clickTanslators
Here duplicate For further editing and rename it to name you choose
and now important
important First select:
Place drawings into: Single DXF/DWG file
and after that select
Save Layout into: Model Space
Now clik Save setting & Close
Now choose that folder in Check Merge to one DWG file
once more check that it's choosen right translator
and just click Publish