# for simplicity, these commands are all global. You can add `guild=` or `guilds=` to `Bot.add_cog` in `setup` to add them to a guild.

import discord
from discord import app_commands
from discord.ext import commands

class MyCog(commands.Cog, app_commands.Group, name="parent"):
  def __init__(self, bot: commands.Bot) -> None:
    self.bot = bot
    super().__init__()  # this is now required in this context.
    
  @app_commands.command(name="sub-1")
  async def my_sub_command_1(self, interaction: discord.Interaction) -> None:
    """ /parent sub-1 """
    await interaction.response.send_message("Hello from sub command 1", ephemeral=True)
    
  @app_commands.command(name="sub-2")
  async def my_sub_command_2(self, interaction: discord.Interaction) -> None:
    """ /parent sub-2 """
    await interaction.response.send_message("Hello from sub command 2", ephemeral=True)
    
async def setup(bot: commands.Bot) -> None:
  await bot.add_cog(MyCog(bot))
  # or if you want guild/guilds only...
  await bot.add_cog(MyCog(bot), guilds=[discord.Object(id=...)])