Wrap in command.sublime-snippet

<snippet>
	<description>Wrap selection in LaTeX command</description>
	<content><![CDATA[
\\${1:cmd}{$SELECTION}
]]></content>
	<!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
	<!-- <tabTrigger>hello</tabTrigger> -->
	<scope>text.tex.latex</scope>
</snippet>