You have to manage multiple collections for each individual product. and assign the collection to the related products. if you are looking g help I will do it for you.
Hi @newbieauthor , I make sure you copied code from card-collection.liquid file and pasted to card-product.liquid so it caused the issue appear list of collections on collections/all link**.**
Please go to Online Store > Themes > Edit code > Snippets > open card-product.liquid, select Original, and click Save button