Help with modeling WAN connections

[fatman00]

Hi everyone,

We have a termination WAN circuits that I cannot seem to find a good way to model i netbox.
We have a L2 EPL to all sites. On the main site the provider has placed a switch with 2 interfaces in a LAG, terminating on 2 interfaces on our router. On the LAG we have a seperate sub-interface for each EPL to a site.
The LAG has a circuit ID from the provider and each of the sub-interfaces have an ID from the provider.
How do I represent this information in netbox. The best option for me would to just connect the sub-interface on my router to a circuit, but that is not allowed in netbox.

I do not have the provider equipment in my netbox.

provider-if1-------if2
         |         |
       R1-Gi1----R1-Gi2
          \       /
            \   /
            R1-Po1
            /   \
          /       \
    R1-Po1.10     R1-Po1.20