\documentclass{article}
\usepackage[symbols,stylemods={tree},record]{glossaries-extra}
\glsxtrsetgrouptitle{latin}{Latin letters}
\GlsXtrLoadResources[
src={numbers.bib},
type=symbols,
group={letters},% assign group label
set-widest,% needed for 'alttree' styles
save-locations=false
]
\begin{document}
	\printunsrtglossary[type=symbols,style=alttreegroup,\printunsrtglossaryunitsetup{section}%
	\renewcommand*{\glossarysection}[2][]{\subsection*{Summary}]
\end{document}