Hi there thanks for posting in the community! Lucidscale can draw lines between resources that explicitly reference another in the metadata: 

• GCP VPC Network Peering [Network → Network]


• Instance to Subnetwork (Shared VPC line)

Note: If you’ve summarized resources within a Lucidscale View you will need to un-summarize them in order for your networking lines to be rendered in the model

For more information please take a look at our Import and Manage GCP Infrastructure Data article from the Lucidscale Help Center and post any additional questions below.