When upgrading is there an option to input new database details?
No it's probably best to upgrade using your current details or change them in your inc/config.php then upgrade.
No, it just upgrades the one it's already in... edit ./inc/config.php if you need to edit any f the database details.
I've installed a new copy under another database name so if I import my database from the 1.4 install will this work?
Yes, then just upgrade it.
OK Thank you