"Over The Top" is a WWI version of "Command Decision". I've never played it but I suspect it would work as well as the WWII rules.
Likewise, "Great War Spearhead" modifies Arty Conliffe's WWII brigade-level rules. I've not personally tried them but I have come across a web page that promotes their use. There have been several ETS contributions that are apparently for these rules that show off HaT figures to good effect.
In both sets a stand represents a platoon and three or four stands a company.