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The second part is related to product models and families:
You can add as many models as you like, each model should be entered separately without any extra text.
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The last part of the form is the manufacturing and distributing locations:
Select any of the locations related to the main EO location selected in at the beginning of the form. You can select the main location itself as a manufacturing location.
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Scroll down in the product details page to see the certificate section section, from here you can create type approval conformity certificates for the product if the role of the EO is a manufacturer.