Add fictitious subsections to RefTeX TOC

[Kourosh Kalayeh]

Hi Everyone, 

I’m trying to add a "fictitious" subsubsection to the RefTeX TOC so that it 
appears in the RefTeX table of contents but does not render in the compiled 
document. For example, I’d like to add =2.3.1 General= and =2.3.2 Aim 1= to the 
following TOC;
#+begin_example
2.3 Approach
    2.3.0.1 Sub approach-1
    2.3.0.2 Sub approach-2
    2.3.0.3 Introduction
    2.3.0.4 Expected Results, Interpretations, Possible Pitfalls
    2.3.0.5 Statistical Plan
#+end_example

To get the following,
#+begin_example
2.3 Approach
    2.3.1 General
        2.3.1.1 Sub approach-1
        2.3.1.2 Sub approach-2
    2.3.2 Aim 1
        2.3.2.2 Introduction
        2.3.2.2 Expected Results, Interpretations, Possible Pitfalls
        2.3.2.3 Statistical Plan
#+end_example

I have tried =\phantomsection= and =\addcontentsline= as below;
#+begin_src LaTeX
\phantomsection
\refstepcounter{subsubsection}
\addcontentsline{toc}{subsubsection}{Aim 1}
#+end_src
This works with =\tableofcontents= command in LaTeX but not with RefTeX.  

Is there a straightforward way to achieve this in RefTeX?

Thank you for your help!

Best,
Kourosh