Hi,

To add the "Brand" attribute to all your products in Odoo, the most efficient approach depends on the size of your catalog. If you have only a few products, you can manually add the attribute via the Odoo UI by creating the "Brand" attribute, adding its possible values, and assigning it to each product. However, for a large number of products, it’s better to use the import/export functionality. You can first export all products including their IDs and current attributes, then add a column for "Brand" or "Attribute Value: Brand" and fill in the desired values (or leave blank to assign later). After that, import the updated file, making sure to include the IDs to update existing products rather than creating duplicates. For added safety, you can also do this in two steps: first add the "Brand" attribute to all products without values, then assign or import the values in a second step. This ensures efficiency while minimizing the risk of errors, and always make sure to back up your database before performing bulk imports.

Hope it helps.