Can anyone suggest an elegant way of storing an array in a custom field, where the same value can appear in more than one element, ie. ["message","message","message2","message2"]. At the moment, I'm pasting directly in a text field, but would ideally like to make it more accessible to ordinary users.

could you do a custom multi-select (or single-select list/record) field with duplicate labels, but unique ids? Not sure if NS allows you to do that