Hi,

1. Custom barcode/label – The standard Odoo label only shows a few fields. To add size, weight, type, company, MRP, wholesale price, or even a product image, you’ll need to customize the report template (report.product_template_label). This can be done with Studio (adding extra fields in the QWeb template) or with a small custom module if you want full control of the design.
2. Automatic product codes – You don’t need to enter barcodes or internal references manually. You can set up a sequence so Odoo generates a unique code for every new product. In developer mode go to Technical → Sequences & Identifiers, create a sequence, and assign it to the product default_code (internal reference) or barcode field. With that, each new product gets a unique code automatically.

So: label customization = template change, unique codes = sequence.

Hope this helps!