How can I transfer assembly items from QB POS to a new system?

I’m in the same boat. No fractional quantities and the “app” for that charges $30/month plus a per use fee and is so rudimentary to be ridiculous. I also have the issue with Assemblies. Have been spending hours and hours on Shopify’s chats and just receive form responses with no solutions. Still can’t migrate properly. Shopify isn’t even syncing with their own Stocky app and so far I’ve been on that chat for an hour with no solution. this is an utter nightmare