No. Sometimes they will let you use a TS for a CS or for a couple of snacks (particularly during free dining when it's tough to get into a sit down restaurant), but you cannot use a CS for a TS credit even with an additional payment.
That's correct! You have a few options. You can upgrade your plan to the regular dining plan or you could just pay for the TS meals and still keep your QS plan. If you only have a few TS meals for your trip and don't plan on having one every day, that might be cheaper. I know at one time you were allowed to downgrade (1 TS Meal= 2 QS meals ) but they never let you trade up QS meals for a TS credit.
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