[IMP] subscriptions: overhaul of the basic docs

This commit improves the structure of the Subscription doc and updates
its content (recurring products, subscription plans, sales flow)

task-3222232

closes odoo/documentation#4068

X-original-commit: 878fc0e21f
Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>
Co-authored-by: Xavier Platteau <xpl@odoo.com>
Co-authored-by: Tom Aarab <toaa@odoo.com>"

content/applications/sales/subscriptions/renewals.rst

@@ -0,0 +1,82 @@
+====================
+Renew a subscription
+====================
+
+The key feature of a subscription business model is the recurring nature of payments. In this model,
+customers pay a recurring amount in exchange for access to a product or a service.
+
+.. raw:: html
+
+   <div align="center" style="color:#AD5E99; font-size: 2rem ;margin: 20px 0"> <b>The renewal of a
+   subscription is the process followed by each customer when willing to pursue a
+   subscription.</b> </div>
+
+Each subscriber experiences this renewal process monthly, annually, or sometimes more, depending on
+the duration of the contract. Most subscription companies choose to automate their renewal processes
+but, in some cases, manual subscription renewals are still the preferred option.
+
+With **Odoo Subscriptions**, you can have all your subscriptions in one application, suggest an
+automatic subscription renewal to your customers (as well as a manual one) and, finally, filter all
+your subscriptions and easily find those to renew (with the help of the tag *To renew*).
+
+Renew your first subscription
+=============================
+
+Before renewing a subscription, be sure to check out our documentation on how to
+:doc:`Create a quotation <../subscriptions>` using subscription
+products. Indeed, once confirmed, a quotation becomes a sales order and a new subscription is
+automatically created. Therefore, this subscription has the status *In progress*. From there, you
+have the possibility to renew the subscription. In the Other Info tab, underneath the To Renew
+section, you can activate the *To renew* option. When activated, a yellow tag automatically appears
+in the upper right corner of the subscription.
+
+.. image:: renewals/renew-your-subscription.png
+  :align: center
+  :alt: Renew your subscription with Odoo Subscriptions
+
+.. important::
+   The *To renew* tag is automatically ticked when a payment fails. This indicator also appears
+   on the customer portal. To visualize that, you just have to click on the *Customer preview*
+   button. The tag *To renew* appears on the top right corner.
+
+   .. image:: renewals/customer-preview-of-a-renewal.png
+     :align: center
+     :alt: Customer preview of a renewal with Odoo Subscriptions
+
+When a subscription needs to be renewed, you have the possibility to use a new button called
+*Renewal quotation*. By clicking on it, a new quotation is created. From there, start a basic sales
+flow allowing you to send the quotation by email to your customers or to confirm it. It is better to
+first *Send by email* the quotation to your customers in order to have their confirmation and, then,
+*Confirm* it in **Odoo Sales**.
+
+.. note::
+   In the Chatter of this new quotation, it is mentioned that "This renewal order has been created
+   from the previous subscription". Once confirmed by your customers, this quotation becomes a
+   sales order and a new sale is mentioned in the upper right corner of the subscription.
+
+   .. image:: renewals/renew-a-quotation.png
+     :align: center
+     :alt: Renew a quotation with Odoo Subscriptions
+
+   By clicking on the *Sales* button, you have a summary of your sales orders in a list view.
+   The only difference between your two quotations is the description underneath the
+   *Subscription Management* category. There, you can easily visualize which one is your renewal.
+
+   .. image:: renewals/subscription-management-category.png
+     :align: center
+     :alt: Renewal as Subscription Management form in Odoo Subscriptions
+
+Visualize your subscriptions to renew
+=====================================
+
+Finally, if you want to visualize all your subscriptions and easily find those to renew, you can go
+to your *Subscriptions dashboard* and use the filter *To renew*.
+
+.. image:: renewals/subscriptions-dashboard-with-the-to-renew-filter.png
+  :align: center
+  :alt: List view of all subscriptions and use of the filter to renew in Odoo Subscriptions
+
+.. seealso::
+   - :doc:`../subscriptions`
+   - :doc:`plans`
+   - :doc:`products`