[ADD] inventory: virtual_warehouse

New doc to explain how virtual warehouses work.

inventory/management/adjustment.rst

@@ -7,4 +7,5 @@ Inventory Adjustment
    :glob:
 
    adjustment/initial_inventory
-   adjustment/min_stock_rule_vs_mto
+   adjustment/min_stock_rule_vs_mto
+   adjustment/virtual_warehouses

inventory/management/adjustment/virtual_warehouses.rst

@@ -0,0 +1,52 @@
+======================================
+TaKing stock from different warehouses
+======================================
+
+When you plan to deliver a customer, you don’t know in advance if the
+products will come from Warehouse A or Warehouse B. You may, in some
+cases, need to take stock from different warehouses. With *Odoo*, you
+can configure this by using the concept of virtual warehouses. Let us
+show you how to set those virtual warehouses.
+
+Set up virtual warehouses
+=========================
+
+Let’s say you have two warehouses: Warehouse A and Warehouse B. Create a
+new warehouse, that will be a virtual one. It will allow you to take the
+stock from A or B. To do so, go to your inventory app settings and
+enable the multi-warehouses feature. Then, go to the warehouses menu and
+click on create.
+
+.. image:: media/virtual_warehouse01.png
+   :align: center
+
+.. note::
+	The *Storage Location* feature will be automatically enabled. Good
+	news, because you will need it later in the process.
+
+Now, you have to make sure that the main stock locations of warehouse A
+and warehouse B are children locations of the main stock location of
+warehouse A + B. Go to the locations menu, and edit the main location of
+your two warehouses. Then, change their parent location to main location
+of warehouse A+B.
+
+.. image:: media/virtual_warehouse02.png
+   :align: center
+
+Sell a product from the virtual warehouse
+=========================================
+
+Let’s say you have two products, one stored in warehouse A and one
+stored in warehouse B. Now, you can create a new quotation for one of
+each product. Go to other information and choose Warehouse A+B in the
+shipping information.
+
+.. image:: media/virtual_warehouse03.png
+   :align: center
+
+Once you have done it, you can convert it to a sales order. Then, a
+delivery order will be automatically generated, with a product reserved
+in warehouse A and one in warehouse B.
+
+.. image:: media/virtual_warehouse04.png
+   :align: center