How far can a man go basing breedings on one simple question? Look at the two dogs considered for breeding and simply ask..."Do I want more dogs like this?"
If it's an easy yes, probably works

If there's any discussion or pause, why do it?

There are so many good all around high quality dogs, why ever settle for less?

This can be done within a family, linebreeding or with crosses. I personally don't like seeing more than 3 prominent bloods together, but it works there too.

Breed dogs that check the most important boxes for you to dogs very very similar. You're not going to add 2 different traits together and get both. So start with complete dog and breed to complete dogs.

That's my 2 cents. It won't buy you nothing!

Be Blessed