<human>: Condense the text into a few key points

For context, this is the porch potty ( We have two dogs, a Yorkie and a Poodle. Neither are entirely reliably house broken but they are crate trained. We've had the Yorkie for over a year (trying to get him potty trained the whole time) and the Poodle for one month. They are both almost 2 yrs old. 

We walk them outside and reward them when they relieve themselves outdoors. Everytime they pee/poop in the correct place, we say "Go potty" and give them a treat. We have tried to get them to use the porch potty (it is on our balcony) with no success. 

Before we got the Poodle, we tried one day to get the Yorkie to use the porch potty by only giving him that as his option to relieve himself; we didn't take him outside to his normal area. Our Yorkie held his pee for almost 24 hours and ended up peeing in his crate rather than relieving himself on the porch potty. 

We have tried catching our Yorkie's pee in a cup and pouring it on the porch potty. They have both relieved themselves on the porch potty less than a handful of times seemingly by accident. We praised and fed them when they did this. But that was weeks ago and no luck since then.
<bot>: How do we teach them that the porch potty is a place that they are allowed to (and encouraged to) pee/poop?