Is it possible to split the

Pulumi.yaml

resource definition up between multiple files? Not seeing any docs around this

not at this time no, can you explain your use case?

I'd like to structure it by functional groups. I need to seed a number of k8s namespaces with regcreds, would prefer to break that out.

best bet is to file an issue in github.com/pulumi/pulumi-yaml

looks like there's one open, thanks https://github.com/pulumi/pulumi-yaml/issues/227