Guys, need help/advise.

I would like to change a little bit the way how messages are displayed. For example if user(Guru) post a message then user(A) will replay to it (this part is ok because the reply is indented).

Then another user(B) will replay to user(A) which is a not a response to the main subject. Is it possible to add another indent to make it more obvious ?

As on picture below ...

Doable ?