Hi Joannis,

Thanks for contacting us here.

First, you can kindly refer to this doc for more instructions on how to set up quantity rules: https://doc.wpclever.net/woosb/wpc-plugins-wpc-product-bundles/wpc-product-quantity-for-woocommerce/.

If you still cannot make it work, kindly provide us with more screenshot or preferably a video to show us the issue. We will guide you further.

Best regards.