'menu': [
  {
    'label': 'Packages'
    'submenu': [
      'label': 'Sort Lines'
      'submenu': [
        { 'label': 'Sort', 'command': 'sort-lines:sort' }
      ]
    ]
  }
]

'menu': [
  {
    'label': 'Edit'
    'submenu': [
      'label': 'Lines'
      'submenu': [
        { 'label': 'Sort', 'command': 'sort-lines:sort' }
      ]
    ]
  }
]

Move menu location to Edit > Lines > Sort
Move menu location to Edit > Lines > Sort
