oldbloke's mutterings

Easiest way is to enter a gallery as you upload each one rather than trying to sort it out afterwards (though to be honest the creation of many separate FB_in galleries looks like a bug to me albeit one that's been there a long time — try a support request and see what they say?).

However, if you create galleries for them to go into and then go to

http://pics.livejournal.com/manage/pic?id=1

you should be able to select the correct gallery from the "Add to" dropdown, untick the existing FB_in gallery, press "Save Changes" and then all you have to do is repeat that for the other 72 images by incrementing the "id=" number at the end of the URL and Bob's your uncle.