In macOS, it is easy to create new keyboard shortcuts to a menu item. Just go to System Preferences → Keyboard → Shortcuts, select App Shortcuts, press the plus button, select the application (or All Applications), type in the menu title of the menu item, and choose a keyboard shortcut:

The menu title can be from a sub-menu item. However, if you have more than one sub-menu item with the same title, the wrong menu item might be selected. The solution is to specify the exact sub-menu item using arrows (->, and no space characters):

Source: How to set Keyboard App Shortcuts for submenu items?