There is no direct way to my knowledge, however if you know how to use classes in Turing what you can do is create a flexible array class which wraps a flexible array. An object of the class inside the record will then be possible. If you do not know how to use classes and you want to learn, there are tutorials linked to in the Turing Walkthrough under Classes Part I/II/III. (Note I will probably be all that you need.)
This topic is where I posted a flexible array class a while ago. The topic relates also relates to your question in a way.
Enjoy
