You can change back to products_model and continue from there. You will need to be sure to always add a products_model as part of the new record(s), and if that products_model is the same as another, the last one "wins" meaning the data from the last occurrence of a products_model will replace the data of any previous one. Only caveat to that is if the categories name is different in a later row, then a linked product will be created for the later one, but all other data will replace the previous. So in effect would create a linked product with all data the same for all "versions" where the products_model is the same.
Otherwise, if you're just entering your own data with "minimal" updating from some source, then you could leave as blank_new and a new product would be identified as a products_id being blank, an existing product (or if you wanted to assign a specific products_id) would have the products_id filled in. Still recommend caution with that, because of the interrelationship of data in the database and it's dependency on the products_id.



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