After creating the data type, you can relate that data type to case type in following ways:
1. Create page mode properties(Single page, Pagelist, Page group) and refer that properties through configure form in steps for case.(or else directly create properties in views and refer those properties through out the case which is supporting in 7.2 above version)
2. After creating the data type, two data pages will be created if you configure source for that data type.Refer that Data pages in UI.