Do you have to do product pre-trial filing for handling the

We are a trading company. Before we did the certificate of origin, we always found an agent. Now the company wants to do the certificate of origin by itself. Our enterprise has completed the filing, but I think there is still a product pre-trial, which needs to be done by the production factory. Do you have to do this product pre-trial? Moreover, we have many product categories and many factories. Sometimes there are more than a dozen factories for one piece of goods. Many factories can't do product pre-trial, which will affect our place of production certificate? At present, the manufacturer of each product name in the certificate of origin system should be written. If we write the actual factory, but there is no product pre-trial, the data cannot be submitted. What impact will it have on our company?