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