def create(group_id, subscription_id, cache_control:'no-cache', custom_headers:nil)
      response = create_async(group_id, subscription_id, cache_control:cache_control, custom_headers:custom_headers).value!
      nil
    end
def create(group_id, subscription_id, cache_control:'no-cache', custom_headers:nil)
      response = create_async(group_id, subscription_id, cache_control:cache_control, custom_headers:custom_headers).value!
      nil
    end
Associates existing subscription with the management group.

 @param group_id [String] Management Group ID.
 @param subscription_id [String] Subscription ID.
 @param cache_control [String] Indicates that the request shouldn't utilize
 any caches.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.