[ADD] sales: How to create tasks from sales orders?

https://docs.google.com/a/openerp.com/document/d/1w69a-C_9C6dO_6-pS4pu5TGKbnEcrQiuwhjzu4jY1YE/edit?usp=sharing

project/advanced/so_to_task.rst

@@ -1,3 +1,115 @@
 ======================================
 How to create tasks from sales orders?
-======================================
+======================================
+
+In this section, we will see the integration between Odoo's **Project
+management** and **Sales** modules and more precisely how to generate tasks
+from sales order lines.
+
+In project management, a task is an activity that needs to be
+accomplished within a defined period of time. For a company selling
+services, the task typically represents the service that has been sold
+to the customer and that needs to be delivered. This is why it is useful
+to be able to generate a task from a sale order in order to streamline
+the process between the Sales and Services departments.
+
+As an example, you may sell a pack of ``50 Hours`` of support at ``$25,000``.
+The price is fixed and charged initially. But you want to keep track of
+the support service you did for the customer. On the sale order, the
+service will trigger the creation of a task from which the consultant
+will record timesheets and, if needed, reinvoice the client according to
+the overtime spent on the project.
+
+Configuration
+=============
+
+Install the required applications
+---------------------------------
+
+In order to be able to generate a task from a sale order you will need
+to install the **Sales Management** and **Project** application. Simply go into
+the application module and install the following:
+
+.. image:: media/so_to_task01.png
+    :align: center
+
+.. image:: media/so_to_task02.png
+    :align: center
+
+Moreover if you wish to be able to invoice your customers based on time
+spent on the task, it is also necessary to install the **Timesheet** module.
+Simply go into the application module and install the following:
+
+.. image:: media/so_to_task03.png
+    :align: center
+
+Create and set up a product
+===========================
+
+You need to configure your service on the product form itself in order
+to generate a task every time it will be sold. From the **Sales** module,
+use the menu :menuselection:`Sales --> Products` and create a new 
+product with the`following setup:
+
+-   **Name**: Technical Support
+
+-   **Product Type**: Service
+
+-   **Unit of Measure**: Hours (go to :menuselection:`Configuration --> Settings`
+    and, under **Unit of measures**, check the **Some products may be
+    sold/purchased in different unit of measures (advanced)** radio
+    button)
+
+-   **Invoicing policy**: You can set up your invoice policy either on
+    ordered quantity or on delivered quantity. You can easily follow
+    the amount of hours that were delivered and/or invoiced to your
+    client.
+
+-   **Track Service**: Create a task and track hours, as your product
+    is a service invoiceable by hours you have to set the units of
+    measures of the product to hours as well.
+
+.. image:: media/so_to_task04.png
+    :align: center
+
+.. note::
+    Link your task to an existing project or create a new one on the fly if 
+    the product is specific to one project. Otherwise, you can leave it 
+    blank, odoo will then create a project per SO.
+
+Create the Sales Order
+======================
+
+Once the product is set up, you can create a quotation or a sale order
+with the related product. Once the quotation is confirmed and
+transformed into a sale order, the task will be created.
+
+.. image:: media/so_to_task05.png
+    :align: center
+
+Access the task generated from the sale order
+=============================================
+
+On the Project module, your new task will appear :
+
+-   either on a related project if you have selected one in the product
+    form
+
+-   either on a new project with the name of related the sale order as
+    title (you can easily change the name of the project by clicking
+    on :menuselection:`More --> Settings`)
+
+.. image:: media/so_to_task06.png
+    :align: center
+
+On the task itself, you will now be able to record timesheets and to
+invoice your customers based on your invoicing policy.
+
+.. note::
+    On Odoo, the central document is the sales order, which means that 
+    the source document of the task is the related sales order.
+
+.. seealso::
+    * :doc:`../configuration/setup`
+    * :doc:`../../sales/invoicing/services/reinvoice`
+    * :doc:`../../sales/invoicing/services/support`