Mutliple RMGs deploy in one block

Hello all,

I want to deploy multiple Gantry crane in one block. so first test 2 gantry cranes assigned one block. but it looks like only one crane working even I setted resource assignement row same as the number of Gantry Crane at yard planner. Would you kindly give me what is wrong??
And could you give me some comment how to use Group object in container terminal library?

Thank you inadvance.