Shipping structure and bundling setup for wine webshop

Hello Squarespace Circle community,

I have a few questions about setting up my wine webshop, and I’d love some insights!

Shipping Structure:
Our shipping setup charges a flat rate of 75 DKK for orders of 1-5 bottles. For orders of 6 bottles or more, we offer free shipping. What would be the best way to display this shipping structure on the webshop so it’s clear and intuitive for customers?

Bundles and Automated Order Processing:
I’d like to create a "bundled" product option with three different wine boxes. Ideally, when a customer orders a bundled package, the system would automatically generate an order and send it to our outsourced warehouse system, specifying the six wines that need to be packed together. Does anyone have experience with setting up this type of automated bundling and inventory integration?

Thanks in advance for any advice you can share!