MultiVariant workflow

[ereallstaff]

Hello everybody, are these all the passage needed to create matrix of product custom fields?  ( I have not find another official tutorial )

https://www.youtube.com/watch?v=lftY28Ma6AY

on vm 3.0.19.5 the matrix doesn't come out , but I have to press any time add children to have a new row. Why don't generate already a full matrix with fields filled already with the previous value? and also why don't manage quantities here?

It's really hard doing this . is there any other way to specify a GTIN for each size f.e.  to work back with normal custom fields and father / children products?

Thank you

[aradralami]

I'm using joomla! 3.4.0 virtuemart 3 I'm struggling to work out custom fields (adding size and colors) even if i follow the tutorial, can you please assist?