What is the recommended approach and practice to map dependencies between application services?

What is the recommended approach and practice to map dependencies between application services?

I understand you map application services to CI's using the Service Configuration Item Association table [svc_ci_assoc] .

Should dependencies between application services be created in the CI Relationship [cmdb_rel_ci] table directly? I notice also there is the ability to at least from the child application service to indicate the parent application service as a tab on the application service form.  I notice the list of options for parent application service doesn't display the full list of application services to link things that way.  I'm assuming it does not appear in the list if the parent app service is already a mapped application service. 

Would be great in addition to an explanation in some cases to provide a quick video demo of the practice of doing some of these things.