Relinking references

Currently working in a document where I have to relink all the references, because all the links were removed. Is there an automated way of doing this?

Also, when I already added a reference to a document (e.g. reference 1) and I want to reference it again later on, is it possible to just call #1 or some similar piece of code instead having to look-up the authors/title again from reference 1.

Not sure if these are support questions or new feature haha.