My DM and I, or DD8 and myself, have shared many CS & TS meals on DDP. We've used the plan 4 times now (first time we paid for it!

). The very first time we used the plan (Jan. 05) the only problem we had with sharing was if they had rung us up with a (non-alcoholic) beverage each. This was explained to us as how the system did the credits. If you ordered 2 drinks for adults (non-alcoholic) and 1 for a kid, then you would be charged 2A/1K credit for your meals. Once we knew this we made sure we only ordered 1 A beverage if we were sharing. This worked fine as sometimes my DM would order wine, which isn't covered anyway. If we did order another beverage, we would pay for it OOP. I don' think this is how it's done anymore.
We always make sure we explain to our server if we are sharing, and we haven't had a problem. Noone has said no, you can't.

My DM and I share meals all the time, even here at local restaurants. We've shared meals at Kona, Spoodles, Narcoossee's, 50's PTC, etc. We've also saved DD8's credits by paying for her OOP at some of the 2 TS restaurants. This way what with the A credits we've saved by sharing, and paying for some K meals OOP, we've been able to experience more restaurants.

And, just like at home, if we hare a meal, we tip more (if service is good) than the standard percentage.
As far as CS goes, of course you can share-there's no way they know how many people are eating off the meals you get.
Also, I've read that you're not allowed to use your credits for someone not on the plan. Knowing this, when my DNiece25 joined us 1/2 way through our trip, I figured we would have to pay OOP for her meals, unless she shared. Well, when we dined at Boma's I told the server we would be paying for her OOP and he asked why, "are you out of credits" I explained why and he said it wasn't a problem. We had 3A/1K on our DDP, so with 4A/1K eating he would just run 1A through on a separate ticket. This was an unexpected surprise. He even asked me who told him we couldn't use more credits for one meal than we had people listed on our card. Funny, huh?
Anyway, don't sweat it, you can share. And with the previous plan inc. appetizers, sharing was the only was DM and I could save room for dessert.

With appetizers now not inc. this won't be as big a problem.

Of course we'll still share, expecially those places where we'll have to order an appetizter (OOP) since they're so good-like the Sticky Chicken Wings at Kona, or the Calamari at Narcossee's. Yum!
Happy Dining!
As far as how to handle a large group dining with 3 different reservations-I think they'll want to run each of your's on separate bills. I don't see how else they could do it and not make a huge mess of things.
Separate checks is the way to go!
