The puppies are young yet.
I usually put them in an area with papers inside and then, weather permitting move them to an outside area that is all wood chips. After a week, I move them back inside where they can go in and out on their own, making sure the outside area has wood chips, and the inside area is pretty small -- 4x4. After a few days, I can increase the inside area and they generally take themselves out to potty.
This last litter, after moving them back in, no accidents in the house. But that does not mean they are house trained. It means they have a good start on it. They will still need to learn to let their new owner know when they got to go. Most of the people tell me they have had no accidents or only a couple, and house trained really easily. Sometimes hanging a bell on the door you are going to take them out at works really good. One day you are sitting there and hearing the bell, and wondering "what's that -- uh-oh, where's the puppy???" And you go to the door and he happily goes outside and potties.
The thing is, I do no corrections when it comes to any form of potty training with a litter. In fact, I never tell them, Go Potty, when I have them in the right spot. I set it up for them to want to go in a certain location, but I am not giving any negative experience about pottying, which provides a dog that has been kept clean, and has got the idea that pottying is best kept away from sleeping/eating areas, but has not been trained for this -- a blank sheet so to speak. So the new owners won't have to manage potty-issues before they can begin the whole schedule/potty training stuff.
Right now I have two yearling bitches and an old lady who share two kennels. They keep the front one free of waste, and poop in the back of the second one. How did they figure that out? No idea. But I like that they did. Some dogs are just cleaner than others. I have another bitch that just doesn't feel happy unless she walks in her poop, and she enjoys splashing her water, paddling it out of her bucket. Nice bitch, but she makes me crazy.
If you are trying to teach the puppies to go in only one section of an indoor area, you're probably better off teaching them nothing regarding pottying. Just let the new owners do it.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.