Hi,
It seems that you are looking to route a few tagged VLANs over a single/multiple ethernet ports.
For this, create the needed VLAN IDs in Network -> VLANs -> Port-based and set 'tagged' on your desired ports. For example, set both VLAN IDs '10' and '20' on port 2 of the device to tagged.
Then, create two interfaces in Network -> Interfaces to reflect your desired VLAN networks, such as the subnet. Do not forget to select the newly created VLAN in the physical settings when configuring the VLAN interface. I suggest you take a look at our wiki article available here that describes how to configure VLANs. The difference is that you will need to set a few VLANs to 'untagged' on the same port, not just one.
Kind Regards,
Andzej