Create two navigation link for single table in rails_admin gem

I have one table named User.

In that i have two type of record :

1) Corporation

2) Agency

Field name is is_agency?(Boolean). If is agency then true and if is corporation then false.

I want to display User table to two different table Corporation and Agency in admin side. I used rails_admin gem.

How can i differentiate using "is_agency?" field ?

I check rails_admin gem documentation but i did't find any thing about this.

Please help me to find out this solution, it will save my hours.