Log into your WiseHosting Game Panel from HERE and click Manage Server on the server you'd like to assign more ports to.
From there go to Settings -> Network.
From there just click on Create Allocation and a new open port will be assigned to your server. You're also able to make notes for the new ports you assign to keep track of them better.
Now just open your desired mod/plugin config file and use your freshly allocated port for it.
If you have any issues please contact us through the Support Tickets.