Olaf, I can't show you a concrete example, but can tell you what you should do.
For example, if you want to combine ansible control host with seed you should add a host into the [seed] group the same way as described ansible control host:
[seed]
seed1234 ansible_connection=local
The seed1234 is a seed host where now you should run ansible.
For example, if you want to combine seed-hypervisor with seed you should add seed host to the [seed-hypervisor] group or create [seed-hypervisor:children] group with seed group/host inside.
[seed-hypervisor]
seed1234
Before doing changes you need to read: