Anyone ever tried doing an Update for the journal Lines? Not sure if that's possible. There's a whole bunch of Line Department's that need changing. It's an absolutely grim job to do manually...

Just select sublist override option that’s easy way because journals don’t have lineId

Note that doing a sublist override doesn't technically edit the fields you want to change. There's no way to truly 'edit' a JE line. The override option is actually blowing away the existing lines of the JE and re-inserting whatever you have in your import spreadsheet. So you want to be sure than the spreadsheet you're using to import has all the values in it that you don't want to change or you'll lose them. Examples are Memo, Class, Location, etc. I might have learned that the hard way once...