We need to register EORI numbers against customers/suppliers - can a section be added?

Hello Itoeurope, for customers you could add a custom field for that (cog in top right>account and settings>Sales>custom field) The supplier's section you would have to use the description or the memo section as an alternative. Or you could use locations from the tracking but you would have to create a location for each number which if there is a lot would be a big process