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Scroll down in the product details page to see the certificate certificates section, from here you can create type approval conformity certificates for the product if the role of the EO is a manufacturer.
You can see also the notified body managing this product.
If the EO is managed by an NB all products for that NB will be auto-assigned to that NB.
If EO is not managed by NB then the EO user has to assign the product to an NB. EO user, in this case, can also un-assign the product from NB if no certificate is published, in-progress or suspended.