The sequence tag is simply used to duplicate the same commands into different places in a YAML file. An example is below. By using "sendMessage'' this means that it will check in the file for that location for a list in the file. Once it has found it, wherever the sequence is, it will insert those commands into the item's commands.
panels:
adminPanel:
perm: default
rows: 5
title: '&6&lAdmin Panel'
commands:
- mod
empty: 'Black_Stained_glass_pane'
sendMessage:
- console= title %cp-player-name% times 20 60 20
- console= title %cp-player-name% subtitle {"text":"Has recieved their punishment","color":"green"}
- console= title %cp-player-name% title {"text":"%cp-player-input%"}
item:
'22':
material: COMPASS
name: '&bBan'
commands:
- cpc
player-input:
- 'console= ban %cp-player-input%'
- 'sequence= sendMessage'
'20':
material: BOOK
name: '&4Kick'
commands:
- cpc
player-input:
- 'console= kick %cp-player-input%'
- 'sequence= sendMessage'
'24':
material: orange_dye
name: '&6Warn'
commands:
- cpc
player-input:
- 'console= warn %cp-player-input%'
- 'sequence= sendMessage'