There's no way to use the repeat function outside of a resource, as you've no doubt discovered. The best alternative is really to generate the template using some external system (e.g. jinja templating).

However, another option is to use a ResourceGroup. You can't just create a group of OS::Neutron::Port resources though, you have to define another template that contains a port resource and has parameters for the index and the list of netNames, and then select the appropriate name from the list inside the template.

Hello you can create by this

**

resources:  
        piyush_net_1_port:
             type: OS::Neutron::Port
             properties:
             network: { get_param: id0 }
             name: piyush_net_1_port

        piyush_net_2_port:
             type: OS::Neutron::Port
             properties:
             network: { get_param: id1 }
             name: piyush_net_2_port

** for multiple port same keep extending value