Send custom fields from WordPress to AWeber through the PMPro AWeber addon. Your fields must be created already in AWeber and also stored as user meta for the users. Add this code to your active theme's functions.php or a custom plugin.

my_pmpro_aweber_custom_fields.php

/*
	Send custom fields from WordPress to AWeber through the PMPro AWeber addon. 
	Your fields must be created already in AWeber and also stored as user meta for the users.
	Add this code to your active theme's functions.php or a custom plugin.
*/
function my_pmpro_aweber_custom_fields($fields, $user)
{
	$fields['custom_field_name'] = get_user_meta($user->ID, "custom_field_name", true);
	return $fields;
}
add_filter("pmpro_aweber_custom_fields", "my_pmpro_aweber_custom_fields", 10, 2);