Magento 1.9.x Custom Module extending soap api V2 salesorder.info

I would like to extend magento 1.9.x soap api "[login to view URL]" v2 to include a field called "selling_manager_id" which fetch a joined $sql column. See below for the $sql query: $sql ="SELECT a.entity_id, a.increment_id, [login to view URL], b.magento_order_id, c.order_id, c.selling_manager_id FROM `sales_flat_order` AS a LEFT JOIN `m2epro_order` AS b ON b.`magento_order_id`=a.`entity_id` LEFT JOIN `m2epro_ebay_order` AS c ON c.`order_id` = b.`id` WHERE a.increment_id = '$orderIncrementId' ORDER BY a.entity_id DESC"; I already have someone to develop a similar module but it extends to a different field. Please see the screenshot for hints how its works. 1. app/code/local/Tm/Apiordersellingmanagerid/etc/[login to view URL] 2. app/code/local/Tm/Apiordersellingmanagerid/etc/[login to view URL] 3. app/code/local/Tm/Apiordersellingmanagerid/etc/[login to view URL] 4. app/code/local/Tm/Apiordersellingmanagerid/Model/Sales/Oder/Api/[login to view URL] [login to view URL] It should be an easy developement; it is just that I couldn't figure out the rest.