Hi Mamunur,
We are not going to post a screen recording on your support forum for security reasons.
This is a huge issue. Every time a new attribute gets added to woo, it wipes out all your plugin variations for the same product. On some products we have 60 variations+. So we have to re-do these each time. Please can you send me a direct email, so we can communicate that way. I can even give you access to our staging site.
This is very important for us to fix.
Thanks