ATO representation in the back end table

ATO model

                      |__ATO config item

                              |__Option Class1

                                         |__Option Item1

                                         |__Option Item2

                              |__Required Item1

From the above how to find from back end table which item is Model, which item is class and which item is option item. anybody has any query.

how does oe_lookups for 'Item_type' link to this?

Thanks in advance.