Unsure what master_id and override are for on V4

Unsure what master_id and override are for on V4
I don't see them in opencart admin, just on an ExcelPort 4.0.0 export

Currently, these fields are blank

Thank you

I believe those are used for product variants, which is a new thing in OpenCart 4.0. I haven't played around with it much, but you can click the dropdown icon on the far-right and it will say "Add Variant", and then you can create a variant of that product.

Most variant data seems to be unchangeable, and when you change the master product the variant will be changed. I'm not sure what data is changeable --- I think it may just be product options, but I haven't tested it much. If anyone knows, feel free to chime in.