slashCommand.cs

var props = new SlashCommandCreationProperties()
{
    Name = "elite",
    Description = "Commands related to Elite: Dangerous.",
    Options = new List<ApplicationCommandOptionProperties>()
    {
        new ApplicationCommandOptionProperties()
        {
            Name = "status",
            Description = "Get Elite's server status.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
        },
        new ApplicationCommandOptionProperties()
        {
            Name = "carrier",
            Description = "Get a fleet carrier's info.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
            Options = new List<ApplicationCommandOptionProperties>()
            {
                new ApplicationCommandOptionProperties()
                {
                    Name = "id",
                    Required = false,
                    Type = ApplicationCommandOptionType.String,
                }
            }
        },
        new ApplicationCommandOptionProperties()
        {
            Name = "distance",
            Description = "Get the distance between two systems.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
            Options = new List<ApplicationCommandOptionProperties>()
            {
                new ApplicationCommandOptionProperties()
                {
                    Name = "system1",
                    Required = true,
                    Type = ApplicationCommandOptionType.String,
                },
                new ApplicationCommandOptionProperties()
                {
                    Name = "system1",
                    Required = true,
                    Type = ApplicationCommandOptionType.String,
                }
            }
        },
        new ApplicationCommandOptionProperties()
        {
            Name = "system",
            Description = "Get info about a system.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
            Options = new List<ApplicationCommandOptionProperties>()
            {
                new ApplicationCommandOptionProperties()
                {
                    Name = "system",
                    Required = true,
                    Type = ApplicationCommandOptionType.String,
                }
            },
        },
        new ApplicationCommandOptionProperties()
        {
            Name = "bodies",
            Description = "Get celestial bodies in a system.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
            Options = new List<ApplicationCommandOptionProperties>()
            {
                new ApplicationCommandOptionProperties()
                {
                    Name = "system",
                    Required = true,
                    Type = ApplicationCommandOptionType.String,
                }
            },
        },
        new ApplicationCommandOptionProperties()
        {
            Name = "factions",
            Description = "Get factions in a system.",
            Type = ApplicationCommandOptionType.SubCommand,
            Required = false,
            Options = new List<ApplicationCommandOptionProperties>()
            {
                new ApplicationCommandOptionProperties()
                {
                    Name = "system",
                    Required = true,
                    Type = ApplicationCommandOptionType.String,
                }
            },
        },
    },
};