Hi Kim,
Have you explored the recently added "Publications" tab? It is only available in Full view, but allows you to (i) keep most of the variables [like language name, iso-code, etc.] the same, while (ii) modifying the variables per publication for those that need to be different [main title, books, etc.]. There's a column on the left of the variables on the Peripherals tab which lets you set/check/tick which ones need to be specified (i.e. unique to each publication) on the Publications tab.