\newcounter{bptnhsa}
\def\bptnhsaadd{\stepcounter{bptnhsa}\thebptnhsa}
\renewcommand{\thebptnhsa}{\arabic{bptnhsa}.\thesection}
\makeatletter
\@addtoreset{bptnhsa}{section}
\makeatother
\def\bptnhsaadd{\stepcounter{bptnhsa}\thebptnhsa}
\renewcommand{\thebptnhsa}{\arabic{bptnhsa}.\thesection}
\makeatletter
\@addtoreset{bptnhsa}{section}
\makeatother