Please humor me and read the documentation as suggested:
http://www.advancedcustomfields.com/resources/functions/has_sub_field/
Also, for your information:
The Advanced Custom Field’s API makes it very easy to display field data in your theme. However, you must be confident with PHP programing and able to customize a WordPress template. Here’s some useful links to get started:
Diving into PHP – http://blog.themeforest.net/screencasts/diving-into-php-day-2/
Diggin into WordPress – http://digwp.com/
source: http://www.advancedcustomfields.com/resources/getting-started/displaying-custom-field-values-in-your-theme/
