How to implement sub-menu items with doted(...) in WPF

For sub-menu items you should be using arrow as shown in this link

https://stackoverflow.com/questions/55820356/how-to-properly-create-a-sub-menu-for-a-menu-item-in-wpf

If you need ellipsis, then it conveys to the user that on click of the menu it is going to show a dialog window to get user inputs.  It is just three dots you need to add to the caption/text.

Refer this link

https://thedeveloperblog.com/wpf/menu-wpf 

Check this link

https://stackoverflow.com/questions/55820356/how-to-properly-create-a-sub-menu-for-a-menu-item-in-wpf