Activities of "primalpat"

I am looking for the "best practices" way. For example: If I have an AppService for tenants where a single function exists to create tenants, but in order to create a tenant I need to also create a different entity and save it to the database for an ID, how would I accomplish this without repeating code all over the place?

public class TenantAppService : ApplicationService, ITenantAppService
    {
        private readonly IRepository<Tenant, long> _tenantRepository;

        public TenantAppService(IRepository<Tenant, long> tenantRepository)
        {
            _tenantRepository = tenantRepository;
        }

        public void CreateTenant(CreateTenantInput input)
        {
            Logger.Info("Creating a tenant for input: " + input);

            //Create a new Address entity with given input's properties
        }
    }