Not exactly sure what you’re looking for. Let’s see if I can explain it.
You have a custom post type called shops and the posts of this post type have custom fields for choosing links.
You have a custom field field on pages that allows the selection of a post from the shops post type.
You want to also be able to choose which of the links from the related shop to display on the page?
If I have this right, no, this is not possible without a significant amount of custom coding.
