Creating Complex Product Variations

Hello,

Does anyone know how to create a complex variant to a product? We run a meal prep business which has various options for meal choices, for example:

A 5 day breakfast package has 6 possible meal options, how can I get the options to show days and then people select which meal they want for that day?

When I try this method out I'm prompted with a message saying the product is unavailable?

Any ideas?

Thank you in advance.