Menu configuration

In order to show the item on the /ia menu you must open menu.yml and add the item name to the category you want (in this example I added it to the hoes category):

hoes:
  enabled: true
  icon: ruby_hoe
  name: '&3&lHoes'
  #permission to allow user to see this category
  permission: 'custom.permission'
  items:
    - ruby_hoe
    - crystal_hoe
    - spinel_hoe
    - turquoise_hoe
    - aqua_hoe
    - amethyst_hoe
    - my_new_custom_hoe

You can notice there is a special category named all, it has a special property show_all_items which allows you to show all the items you created adding them to this category. If you want to hide some items from this GUI just use hide_items property.

all:
  enabled: true
  icon: ruby_block
  name: '&3&lAll'
  show_all_items: true
  # special tag to hide some items from the GUI
  hide_items:
      - icon_left_grey
      - icon_left_blue
      - icon_right_grey