To change the link number, referring to paragraphs, you want to change \theparagraph. Here is an example:
\documentclass[12pt]{article}
\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{\roman{paragraph}}
\usepackage{lipsum}
\begin{document}
\paragraph{foo} \lipsum[1]
\paragraph{bar} \lipsum[2]
\end{document}
\roman \roman, \arabic, \alph, \alph. , , alphalph \alphalph 26 .
, \paragraph " ". , , , :
\newcommand\PARA{\paragraph{}}
, , ""; .. reset "1" . -
\usepackage{remreset}
\makeatletter
\@removefromreset{paragraph}{section}
\makeatother