What is it for (in image) ? How and what to use it for?
is this VM3 and J3?
And where is setup every customfield?
I think this is SKU for child, but from this image I don't confirm, we use CF4All.
I also use CF4All, but not in every case.
This is what I see in the latest version of Virtuemart 4+ for Joomla 3/4
These fields appear when I select Custom Field Type: string
It is displayed in every product :o