Hi Mario, one method you can use to do that is to select all your objects and use File > Export to write them to a new .3dm file.

Export only writes the selected objects and only the styles used by those objects to the exported file, unlike "SaveAs" which writes the whole list.

Then open up your compacted export file and use File > Import to open up a blank file that has your full set of styles in it. That will place the unused ones below the compacted ones.

You can use that method right now but I'll see about making a script to do it too.

- Michael