Use multiple ModelViewSet for a REST call

I'm using Django REST Framework's ModelViewSet. Inside "ModelViewSet-1", I need to break down a POST (create) request into 3 parts. The first part will be used by "ModelViewSet-1" and I need to delegate the other two parts to "ModelViewSet-2" and "ModelViewSet-3" respectively. Can someone suggest a workflow?

For now, I'm thinking of using python's 'requests' library, to send circular HTTP calls from 'ModelViewSet-1" to the other ModelViewSets. But that doesn't seem elegant.