Hello,

While importing product templates pass variants (system will create individual products for each variant)

Dear Subbaraco,

thanks for you quick reply. Unfortunately this is not the issue! I am aware of auto creating the variants, but my question is how I can add the Simple_Product_ID to each variant while creating to be able to identify the variant later on. E.g. to run updates on the variant etc. 
Is there a way of adding this ID right away? If not, what is the best way to add this later on and how can I then Identify which variant is the correct one for which Id.

P.S. I just found following presentation using the method 'load' to run performant imports and also abstracting the difference between create and update.

https://www.odoo.com/de_DE/slides/slide/how-to-import-large-complex-data-into-odoo-455/pdf_content

Does anyone has some information on the 'load' function? I cannot find anything about it on the Odoo documentation. Is it still available for Odoo12 and is it recommended to use? Some how the internet does not list a lot about it.