[Tex/LaTex] Automatic referencing of item number in enumerate environment

Question

Here is what I want:

And here is how I want to achieve this:

Just like you have the \label and \ref commands for automatic section number referencing, I wish to have something similar which will auto-reference the specific item number (1.2.1 in my case) without me having me explicitly write it out every time. This will be part of a big report I'm writing, hence I wish to make my work less cumbersome

Here is the code:

\documentclass[]{article}
\usepackage{enumerate}
%opening
\title{}
\author{}

\begin{document}

\begin{enumerate}
\item 1st item 
\begin{enumerate}[{1.}1]
\item 1st nested item
\item 2nd nested item
\begin{enumerate}[{1.2.}1]
\item Useful/Important Information
\end{enumerate}
\end{enumerate}
\item 2nd item
\end{enumerate}

\noindent In this paragraph, I talk a bit about the Useful/Important Information and then reference the item number

\end{document}

Answer 1

I am used to enumitem than enumerate as it is newer and offers much more customizations. As an additional tool, I suggest the use of cleveref for clever referencing as in this code:

\documentclass{article}
\usepackage{enumitem} %% for effortless customization of enumeration
\usepackage{hyperref} %% Just to provide clickable links
\usepackage{cleveref} %% for clever referencing
\crefdefaultlabelformat{(#2#1#3)}
\begin{document}
\begin{enumerate}
  \item{First item}
  \begin{enumerate}[label=\arabic{enumi}.\arabic*]
    \item{First nested item}
    \item{Second nested item}
    \begin{enumerate}[label=\arabic{enumi}.\arabic{enumii}.\arabic*]
        \item{Useful/important information} \label{item:myitem}
    \end{enumerate}
  \end{enumerate}
  \item{Second item item}
\end{enumerate}

\noindent In this paragraph, I talk a bit about the Useful/Important Information and then reference the item number~(\ref{item:myitem}).

In this paragragh, I talk and the point to some information given in~\cref{item:myitem} (Using cref)

\end{document}