How to use subcommands with SlashCommand attribute?

[waxen raft]

I've been looking at the documentation for subcommands in slash commands, but it uses SlashCommandBuilder, and I'm writing a bot that uses classes inheriting from InteractionModuleBase<IInteractionContext>, and the [SlashCommand("name", "desc")] attribute, how do I do subcommands with that attribute?

[foggy jackal]

Give your class the group attribute, then use slashcommand attributes on methods inside it