add_filter( 'el_hidden_fields_checkout_woo', '__return_true' );
2: Remove Billing last name
add_filter( 'el_wce_unset_billing_last_name', '__return_true' );
add_filter( 'el_wce_unset_billing_phone', '__return_true' );
4: Remove billing Company
add_filter( 'el_wce_unset_billing_company', '__return_true' );
5: Remove Billing Addresss 1
add_filter( 'el_wce_unset_billing_address_1', '__return_true' );
6: Remove Billing Addresss 2
add_filter( 'el_wce_unset_billing_address_2', '__return_true' );
add_filter( 'el_wce_unset_billing_city', '__return_true' );
8: Remove Billing Post Code
add_filter( 'el_wce_unset_billing_postcode', '__return_true' );
10: Remove Billing Country
add_filter( 'el_wce_unset_billing_country', '__return_true' );
add_filter( 'el_wce_unset_billing_state', '__return_true' );
add_filter( 'el_wce_unset_order_comments', '__return_true' );