Hi,
Dependent pick lists are not currently supported within the tool but it is actively been looked at.
However, with the new Data Management features that are coming out you can make lists of items and add them to which ever tab you want within the tool. Watch the ITP User Group recording for more information on the new features coming so you can see if they can help you with some of your use case:ITP User Group July
Let me know if you have further questions,
Lauren Griessel