YES!!! That did the trick. Thanks for the help!
For reference, here’s the relevant code and result (I dumped it in my game mode constructor to test it out… probably should go somewhere more appropriate, but it works for now).
static const FName PropertyEditor("PropertyEditor");
FPropertyEditorModule& PropertyModule = FModuleManager::GetModuleChecked<FPropertyEditorModule>(PropertyEditor);
#define LOCTEXT_NAMESPACE "PropertySection"
TSharedRef<FPropertySection> Section = PropertyModule.FindOrCreateSection("Object", "GM", LOCTEXT("GM", "GM"));
Section->AddCategory("Config");
Section->AddCategory("GM");
#undef LOCTEXT_NAMESPACE
