\documentclass[]{article}
\usepackage[a4paper, total={170mm,257mm}, left=20mm, top=20mm,]{geometry}
\usepackage{ifthen}
\def\GWinput#1{\input{/GW/#1}}

\begin{document}
\input{/GW/root/PhysicalQuantities/PhysQuant.tex}
\begin{center}
\underline{\large  The GOLEM tokamak Physical Quantity Definition:}
\newline\newline\newline 
%{\LARGE\bf \GWPhysQuantValueWithName{Tokamak/VacuumVessel/TechnologicalQuantities/MajorRadius}}
{\LARGE\bf \input{ActualPhysQuant}}

\end{center}
\end{document}
