Hi @irakli.patsatsia93, according to the video you are not clicking on the surface target options, but on the overridden station options. So you are getting that prompt because you don't have overridden stations.
Additionally, I am not sure if your assembly has those capabilities of targeting surfaces. You are using custom subassemblies and I could not check this to be 100% sure. Your assembly must have surface target capabilities so you can assign those to it. Are you willing to share your subassembly?
I hope this helps. Best regards!
Camilo Fernández
P.Eng | Transportation
