[ADD] inventory: fifo removal strategy

closes odoo/documentation#7289

Signed-off-by: Zachary Straub (zst) <zst@odoo.com>
Co-authored-by: ksc-odoo <73958186+ksc-odoo@users.noreply.github.com>
Co-authored-by: hojo-odoo <123424465+hojo-odoo@users.noreply.github.com>

content/applications/inventory_and_mrp/inventory/warehouses_storage/advanced_operations_warehouse.rst

@@ -14,6 +14,7 @@ Advanced operations
    advanced_operations_warehouse/cross_dock
    advanced_operations_warehouse/stock_warehouses
    advanced_operations_warehouse/putaway
-   advanced_operations_warehouse/removal
    advanced_operations_warehouse/usage
    advanced_operations_warehouse/cluster_picking
+   advanced_operations_warehouse/removal
+   advanced_operations_warehouse/fifo

content/applications/inventory_and_mrp/inventory/warehouses_storage/advanced_operations_warehouse/fifo.rst

@@ -0,0 +1,97 @@
+============
+FIFO removal
+============
+
+The *First In, First Out* (FIFO) removal strategy selects products with the earliest arrival dates.
+This method is useful for companies selling products that have short demand cycles, like clothes,
+for example. By using :abbr:`FIFO (First In, First Out)`, companies can prevent prolonged stock
+retention of specific styles.
+
+.. seealso::
+   - :doc:`Other removal methods <removal>`
+
+.. example::
+   Various quantities of the product, `T-shirt`, tracked by lot numbers, arrive on August 1st and
+   August 25th. For an order made on September 1st, the :abbr:`FIFO (First In, First Out)` removal
+   strategy prioritizes lots that have been in stock the longest. So, products received on August
+   1st are selected first for picking.
+
+   .. image:: fifo/fifo-example.png
+      :align: center
+      :alt: Illustration of FIFO selecting the oldest products in stock.
+
+.. seealso::
+   :ref:`Lot/serial number setup details <inventory/warehouses_storage/lots-setup>`
+
+.. _inventory/warehouses_storage/arrival_date:
+
+Arrival date
+============
+
+To see the product lot or serial number that arrived in inventory first, navigate to
+:menuselection:`Inventory app --> Products --> Lots/Serial Numbers`.
+
+Then, select the :guilabel:`▶️ (right-pointing arrow)` icon on the left of a product line, in order
+to reveal a list of the product's lots or serial numbers that are in stock. The :guilabel:`Created
+On` field shows the lot/serial number creation date, which is, essentially, the arrival date.
+
+.. example::
+   Serial number `00000000500` of the product, `Cabinet with Doors`, arrived on December 29th, as
+   displayed in the :guilabel:`Created On` field.
+
+   .. image:: fifo/created-on.png
+      :align: center
+      :alt: Display arrival date of a lot for an item.
+
+Workflow
+========
+
+To understand how :abbr:`FIFO (First In, First Out)` rotates products out, consider the following
+example, focusing on three lots of white shirts.
+
+The shirts are from the *All/Clothes* category, where :abbr:`FIFO (First In, First Out)` is set as
+the :guilabel:`Force Removal Strategy`.
+
+The white shirts are tracked :guilabel:`By Lots` in the :guilabel:`Inventory` tab of the product
+form.
+
+.. seealso::
+   - :ref:`Set up force removal strategy <inventory/warehouses_storage/removal-config>`
+   - :ref:`Enable lots tracking <inventory/warehouses_storage/lots-setup>`
+
+The following table represents the on-hand stock and lot number details of white shirts.
+
+.. list-table::
+   :header-rows: 1
+   :stub-columns: 1
+
+   * -
+     - LOT1
+     - LOT2
+     - LOT3
+   * - On-hand stock
+     - 5
+     - 3
+     - 2
+   * - :ref:`Created on <inventory/warehouses_storage/arrival_date>`
+     - March 1
+     - April 1
+     - May 1
+
+To see the removal strategy in action, create a :ref:`delivery order <inventory/delivery/one-step>`
+for six white shirts by navigating to the :menuselection:`Sales app` and creating a new quotation.
+
+After clicking :guilabel:`Confirm` on the sales order, a delivery order with the oldest lot numbers
+for shirts are reserved, using the :abbr:`FIFO (First In, First Out)` removal strategy.
+
+To view the detailed pickings, click the :guilabel:`⦙≣ (bulleted list)` icon, located on the
+far-right of the white shirt's product line in the :guilabel:`Operations` tab of the delivery order.
+Doing so opens the :guilabel:`Open: Stock move` pop-up window.
+
+In the :guilabel:`Open: Stock move` pop-up window, the :guilabel:`Pick from` field displays where
+the quantities to fulfill the :guilabel:`Demand` are picked from. Since the order demanded six
+shirts, all five shirts from `LOT1`, and one shirt from `LOT2`, are selected.
+
+.. image:: fifo/white-shirt-picking.png
+   :align: center
+   :alt: Two lots being reserved for a sales order with the FIFO strategy.

content/applications/inventory_and_mrp/inventory/warehouses_storage/advanced_operations_warehouse/removal.rst

@@ -15,14 +15,14 @@ Odoo automatically select how products are selected for orders:
    :stub-columns: 1
 
    * -
-     - FIFO
+     - :doc:`FIFO <fifo>`
      - LIFO
      - FEFO
      - Closest Location
      - Least Packages
    * - Based on
-     - Incoming date
-     - Incoming date
+     - :ref:`Incoming date <inventory/warehouses_storage/arrival_date>`
+     - :ref:`Incoming date <inventory/warehouses_storage/arrival_date>`
      - Removal date
      - Location sequence
      - Package quantity