You can do that quite easily with the enumitem package and an enumerate environment:
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\setlength{\parindent}{0cm}
\usepackage[shortlabels]{enumitem}
\usepackage{lipsum}
\begin{document}
\lipsum[11]
\begin{enumerate}[label=UR-\arabic*., font=\bfseries, wide= 0pt, leftmargin=2em]
\item Some text, some text, , some text, some text, , some text, some text, some text, some text, some text.
\item Some more text, some more text, some more text, some more text, some more text, some more text, some more text, some more text, some more text, some more text.
\end{enumerate}
\end{document}

\themycounterdo? – WojciechKo Feb 02 '15 at 23:43mycounter– LaRiFaRi Feb 05 '15 at 22:35