Client Request: 

One of our clients wanted to add a message to the checkout page with further details about the shipping address. Specifically they wanted to create a notice to their customers that they can’t ship to P.O. boxes.

Solution:

The following code snippet can be added to your functions.php file. We highly suggest that you create a child theme and make your edits within the child theme functions.php. The text will be added below the “Ship to a different address?” checkbox, and will display as part of the shipping address section that displays after your customer checks the box.

 

Snipet Code:

 

/** <br><!-- [et_pb_line_break_holder] --> * @snippet Add Note below Shipping Address section on Checkout Page - WooCommerce<br><!-- [et_pb_line_break_holder] --> */<br><!-- [et_pb_line_break_holder] --><br><!-- [et_pb_line_break_holder] --><br><!-- [et_pb_line_break_holder] -->add_action( 'woocommerce_before_checkout_shipping_form', 'heartell_nopo_shipping' );<br><!-- [et_pb_line_break_holder] --> <br><!-- [et_pb_line_break_holder] -->function heartell_nopo_shipping() {<!-- [et_pb_line_break_holder] -->echo '<p class="allow">Unfortunately we can not ship to P.O. Boxes. Please provide a valid street address.</p>';<!-- [et_pb_line_break_holder] -->}

Disclaimer: This post is intended as a resource for a professional or someone with existing knowledge on how to edit theme files. Use this information at your own risk. Please be careful as any errors in your theme files can corrupt your website. 

p.s. Thank you to BusinessBoomer for pointing me in the right direction.