How to upload a new gift box with multiple items (grocery category)

Hello,

I was wondering if someone could offer me some help with uploading a gift box to Amazon selling.

I would like to upload a new listing but it would contain different items in one singular box (which would also come as a small or extra large box). This will be a simple chocolate box and I already have approval in the grocery section but am finding it difficult to understand how to create this type of listing.

If someone could help me understand this I would really appreciate this is really struggling with it!

Thank you!