CRUD Sales order line using Webservices

Putxi

How can insert, delete or modify a sales order line using webservices?
I've read a Sales Order using a web service (based on a Sales Order Page). The sales order object has a sales line array with all the sales order lines.
Should I add, modify or delete items in the sales order array and then save the Sales Order? Or should I publish the Sales Order Line Page to insert, modify or delete sales order lines?