So HOW do you make pedigrees from non-pedigreed rabbits?
Rabbits are show by phenotype not genotype
If you have a rabbit that looks like a dutch, you can show it as a dutch even if you have no pedigree. Same thing with Netherland dwarf, Flemish giant, Holland lops or mini rex. What matters most is what the animal looks like.
Where do you start
This gets you your first generation. A doe you've named Lincoln.
Be honest on your pedigreed. If you have mixed in a netherland dwarf into your pedigree to bring down the size of your large holland lops, kept the breed on your pedigree so people will know that.
This way you continue to move forward in your quest to get fully pedigreed animals.
NOW I do have to say this. If you have a fine looking fellow like this who is CLEARLY a mutt it would be helpful to keep a pedigree program for him. BUT he is not any define-able breed, so you would merely be pedigree-ing the offspring in order to help your record keeping, or perhaps to start your very own breed.
Cheta is a dwarf type and I'd love to start my own dwarf breed with his colouring and attitude. But he's not a particular breed, a real little mutt. :) Perhaps I can create a breed called "The Cheta Dwarf" :)