How do we add additional ip to proxmox and assign ip to vm?

Hello rolypoly,

For the host use the WEB-GUI or edit /etc/network/interfaces directly.

For VMs assign their virtual NICs to a bridge using the WEB-GUI - inside the VMs use their OS specific methods.

For CTs you can make it as vor VMs or specify directly an IP using the WEB-GUI.

If you specify precisely you requests (or a typical example) it would be possible to give you more exactly the details you need.

Kind regards

Mr.Holmes