Put line feeds between paragraphs.
In other words take your time trying to deliver your message here in the forum.
An example would be an inventory and assignments database (say desks and computer equipment). Each object type will have unique asset tags. The locations will have a field for each type of object assigned to that location but can multiples (some with 1 monitor, some with 2, others with 4).
The key here is to allow multiple links to a particular object while keeping a one-to-one relationship.
1. I make a list of items I want to get. The title field is the title of the item (if it's a book, movie etc.) or the type of object (if more generic, such as lamp or mirror).
2. I want to give examples. They exist as items in internet shops. Hence, I paste a link to the item in the shop. That's what the link field is for.
3. A specific item will only have one example: The Book written by Author Writerson will be the same item in every shop.
4. A less specific item can be made by different companies, sold in different shops. But those products can have some shared qualities that fit my expectations.
5. I don't want to create separate entries for each example. I only want one item of this kind. What I want is to connect several links to shops and several links to pictures, that show examples of this product.
6. The item I get could be bought from one of the given links, or a different product that is similar enough. The links are so one can examine the characteristics of the products.
7. In some cases, I would like to only give one link in an entry. In other, I might need to give three. I don't know how many before I create the specific entry.
8. I also don't want to have extra empty link fields in those entries that only require one.
9. So, a solution would be to make it possible to auto-add a field of the same type, when I've finished filling in one, and to only some entries.
I hope I've made it clear enough for you.
In feature requests, I found one that's asking for this exact thing. So I can see that as of now, this is impossible. Hopefully it'll be implemented in the future.