first of all… NativeUI is very old… if you’re using the @Frazzle’s one then it’s 4 years old… if you’re using NativeUILua_reloaded… it’s 3 years old… so… pretty much outdated… i’d suggest you to try ScaleformUI for making your menus as it’s new and updated!!
That said…
instead of doing subDivisionMenu.OnItemSelect i’d suggest you to use uniItem.Activated this way each item will have its own function callback when pressed… instead of registering a menu callback each iteration.