Hi, I hope everything is going Great for you at your new job. It's nice to hear your girls are picking up on the pad training. There are sites that sell washable pads which is so economical in the long run ...
http://www.assistedliving-store.com/detail.aspx?ID=409 there are also pad holders, (see amazon.com for low prices on pad holders), in case your girls tend to play with the pads, like my Zander would.
Then there is also the feel of grass...
http://www.petapotty.com/PetitePeta.html.
I have read that when transitioning to pad, whether the pad is inside or balcony ... you take the dog on the leash to the pad and tell them to go potty. Most importantly have a cheerio or piece of meat as a reward when they do go, its important to reward the act immediately and they will get going on the pad a lot faster!! If they don't go when you tell them to, keep a good eye on them so that you can redirect if they start to go on the carpet.
Lots of luck!