Exporting more than one playlist at a time?

In the latest version the added playlist synchronization. Select the playlists you want to sync and export and "synchronize".

I did see that function and thought that must be it but wasn't sure. Many thanks, I'll give it a go! 

OK just had a look. It says automatic sync so it exports automatically each time you add the device. I don't want this. 

ok, but why wouldn't you want the local playlists and the USB playlist to be in sync? I know for me, I would want my exported lists to be exactly the same as the local ones at all times

A few reasons.

I tend to set a new playlist each time I play out depending on venue / genre etc.

Also I've had a few problems with tunes not playing off the usb (see other post) when I play out so I format the USB's each time I put new playlists onto the sticks.