[ADD] How to manage lots of identical products?

https://docs.google.com/document/d/13bkpwntVllj9LWGHXl-Rj62K8wdGP6FjAPYkSIKrE0g/edit#

inventory/management/lots_serial_numbers/lots.rst

@@ -1,3 +1,135 @@
 =========================================
 How to manage lots of identical products?
-=========================================
+=========================================
+
+Overview
+========
+
+Lots are useful for products you receive in great quantity and for which
+a lot number can help in reportings, quality controls, or any other
+info. Lots will help identify a number of pieces having for instance a
+production fault. It can be useful for a batch production of clothes or
+food.
+
+Odoo has the capacity to manage lots ensuring compliance with the
+traceability requirements imposed by the majority of industries.
+
+The double-entry management in Odoo enables you to run very advanced
+traceability.
+
+Setting up
+==========
+
+Application configuration
+-------------------------
+
+You need activate the tracking of lots in the settings. In the **Inventory**
+application, go to :menuselection:`Configuration --> Settings`, 
+select **Track lots or serial numbers**
+
+.. image:: media/lots01.png
+    :align: center
+
+In order to have an advanced management of the lots, you should also
+select **Manage several locations per warehouse**.
+
+.. image:: media/lots02.png
+    :align: center
+
+Then click on **Apply**.
+
+Operation types configuration
+-----------------------------
+
+You also need to set up how you will manage lots for each operations.
+In the **Inventory** application, go to 
+:menuselection:`Configuration --> Operation Types`.
+
+For each type (receipts, internal transfers, deliveries,...), you can
+set if you can create new lot numbers or only use existing lot numbers.
+
+.. image:: media/lots03.png
+    :align: center
+
+Product Configuration
+---------------------
+
+Finally, you have to configure which products you want to track in lots.
+
+Go into :menuselection:`Inventory Control --> Products`, and open the product of your
+choice. Click on **Edit**, and in the **Inventory** tab, select **Tracking by
+Lots**, then click on **Save**.
+
+.. image:: media/lots04.png
+    :align: center
+
+Manage lots
+===========
+
+Transfers
+---------
+
+In order to process a transfer of a product tracked by lot, you have to
+input the lot number(s).
+
+Click on the lot icon :
+
+.. image:: media/lots05.png
+    :align: center
+
+A window will pop-up. Click on **Add an item** and fill in the lot
+number and the quantity.
+
+.. image:: media/lots06.png
+    :align: center
+
+Depending on your operation type configuration, you will be able to fill
+in new lot numbers, or only use existing ones.
+
+.. note::
+    In the scanner interface, you just have to scan the lot numbers.
+
+Inventory adjustment
+--------------------
+
+Inventory of a product tracked by lot can be done in 2 ways:
+
+-  Classic inventory by products
+
+-  Inventory of a lot
+
+When doing a classic inventory, there is a **Serial Number** column. If the
+product has already been assigned with a number, it is already
+pre-filled.
+
+Click on **Add an item** if the product has not been inventoried yet. You
+can easily create lots, just type in a new lot number in the column.
+
+.. image:: media/lots07.png
+    :align: center
+
+You can also just do the inventory of a lot. In this case, you will have
+to fill in the **Lot number**. You can also create a new lot from here. Just
+type in the number, a window will pop out to link the number to a
+product.
+
+.. image:: media/lots08.png
+    :align: center
+
+Lots traceability
+=================
+
+You can check the lot traceability from 
+:menuselection:`Inventory --> Inventory Control --> Serial Numbers/Lots`
+
+.. image:: media/lots09.png
+    :align: center
+
+You can have more details by clicking on the **Traceability** button :
+
+.. image:: media/lots10.png
+    :align: center
+
+.. seealso::
+    * :doc:`differences`
+    * :doc:`serial_numbers`