Transfer Area/Zone

Hi, i'm creating transfer areas/zones for a project but I've encountered a problem. Although i have straddles assigned to the Quay Side Cranes, i need to have Straddles that can work on the yard aspect of the model. So my question is how can i assign straddles that can only work the container yard of the model any ideas or know-how would be greatly appreciated.

You can have a separate strad gang. Use resource assignment table to control this gang serve yard operations.