My family and I will be visiting WDW in a few weeks. We are staying onsite and have the DP. We are meeting up with friends while at the park. They are staying off-site and not on the dining plan. We would like to have a few TS meals with them. How does this work? Do we need to note this on our reservation? Can we tell the server to put it all on one bill, but we will take our TS credits and pay the remainder out of pocket?