One other thing that you can do to make this a little easier in v1 is to hide all the other objects than the current selection. That way after the export is done you can use Ctrl+A to select just those objects and delete them.

You can also use this command for a keyboard shortcut (Go to Options / Shortcut keys to add in a new one), which will hide all objects other than the current selection:

script:var gd = moi.geometryDatabase; gd.invertSelection(); gd.hide(true); gd.selectAll();

Paste the above in as the "Command" part for the new shortcut key.

- Michael