Use CreateOrganizationalUnit with an AWS SDK or CLI

    using System;
    using System.Threading.Tasks;
    using Amazon.Organizations;
    using Amazon.Organizations.Model;

    /// <summary>
    /// Creates a new organizational unit in AWS Organizations.
    /// </summary>
    public class CreateOrganizationalUnit
    {
        /// <summary>
        /// Initializes an Organizations client object and then uses it to call
        /// the CreateOrganizationalUnit method. If the call succeeds, it
        /// displays information about the new organizational unit.
        /// </summary>
        public static async Task Main()
        {
            // Create the client object using the default account.
            IAmazonOrganizations client = new AmazonOrganizationsClient();

            var orgUnitName = "ProductDevelopmentUnit";

            var request = new CreateOrganizationalUnitRequest
            {
                Name = orgUnitName,
                ParentId = "r-0000",
            };

            var response = await client.CreateOrganizationalUnitAsync(request);

            if (response.HttpStatusCode == System.Net.HttpStatusCode.OK)
            {
                Console.WriteLine($"Successfully created organizational unit: {orgUnitName}.");
                Console.WriteLine($"Organizational unit {orgUnitName} Details");
                Console.WriteLine($"ARN: {response.OrganizationalUnit.Arn} Id: {response.OrganizationalUnit.Id}");
            }
            else
            {
                Console.WriteLine("Could not create new organizational unit.");
            }
        }
    }

To create an OU in a root or parent OU

The following example shows how to create an OU that is named AccountingOU:

aws organizations create-organizational-unit --parent-id r-examplerootid111 --name AccountingOU

The output includes an organizationalUnit object with details about the new OU:

{
        "OrganizationalUnit": {
                "Id": "ou-examplerootid111-exampleouid111",
                "Arn": "arn:aws:organizations::111111111111:ou/o-exampleorgid/ou-examplerootid111-exampleouid111",
                "Name": "AccountingOU"
        }
}