Yes, the documentation is not elaborate on that part. Look for external entities: https://docs.mendix.com/refguide/external-object-activities/
Regards,
Ronald
To publish an Odata REST resource with full CRUD you need to enable this in the published OData service. See https://docs.mendix.com/refguide/published-odata-resource/#capabilities
Next you can use the Create and Delete these resources from your client apps using the activities documented in the link provided by ronald: https://docs.mendix.com/refguide/send-external-object/