As of Jetpack CRM v.5.0.0, custom fields created in the WooCommerce Checkout Add-Ons plugin can be synced with Jetpack CRM WooSync. To ensure it will sync properly, follow the guide below on setting up the custom fields.
Custom Fields in Jetpack CRM
Go to Jetpack CRM > CRM Settings > Custom Fields, and add your custom field. For example, Billing Test
. Then, under each custom field title, you will see a slug in teal, billing-test
in this example:

Custom Fields in WooCommerce Checkout Add-Ons
Then, add the same text/slug from the CRM Custom field to the “Name” field of the checkout add-on:

For more information on setting up and configuring custom fields in WooCommerce Checkout Add-Ons extension, please check their guide here.
Note: You may also use a text with an underscore (billing_test
) in WooCommerce Checkout Add-On and it should still sync fine. Jetpack CRMÂ custom fields follow the WP slug convention, thus the CRM custom fields use hyphen in slugs.