I assume that you're referring to a data element that you've setup in AEP Data Collection Tags, a.k.a. Adobe Launch.
When you had setup your List Variable in AA's report suite, you had to specify a separator. The default is the comma ",".
Let's say you are using that default comma. Your data element should then return a string where the values are comma-separated, for example, "one,two,three", which you will then set to your list variable.
Example:
- Let's say you want to track to List Variable 1.
- Your data element is called "the important list". It will, for example, return a value "one,two,three".
- Then in your AA Set Variables action, you can write this in custom code: s.list1 = _satellite.getVar("the important list")
In the above example, s.list1 will get the value "one,two,three". Since List Variable 1 had been configured to recognise the comma as the separator, AA will split that value into "one", "two" and "three", i.e. 3 separate values. If you were to then create a Freeform Table with List Variable 1 as the dimension, you will see three separate rows, one each for "one", "two" and "three".
Hope that helps!