diff --git a/doc/source/Getting_started/Installation.rst b/doc/source/Getting_started/Installation.rst
index 586eb658f75..0390ecb03e1 100644
--- a/doc/source/Getting_started/Installation.rst
+++ b/doc/source/Getting_started/Installation.rst
@@ -65,6 +65,8 @@ The user can select the AEDT application to install the specific workflow.
   :width: 400
   :alt: PyAEDT toolkit manager 2
 
+For more extension information, see `Extensions <https://aedt.docs.pyansys.com/version/stable/User_guide/extensions.html>`_.
+
 
 Install on CPython from PyPI
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/doc/source/Resources/toolkits_ribbon.png b/doc/source/Resources/toolkits_ribbon.png
index 8f33f7825f2..5758f592cbb 100644
Binary files a/doc/source/Resources/toolkits_ribbon.png and b/doc/source/Resources/toolkits_ribbon.png differ
diff --git a/doc/source/User_guide/extensions.rst b/doc/source/User_guide/extensions.rst
new file mode 100644
index 00000000000..773ce572e26
--- /dev/null
+++ b/doc/source/User_guide/extensions.rst
@@ -0,0 +1,36 @@
+Extensions
+==========
+
+PyAEDT extensions provide a simplified interface to perform automated workflows.
+The user can install or uninstall these extensions using the extension manager.
+For more information, see `Extension Manager <https://aedt.docs.pyansys.com/version/stable/Getting_started/Installation.html#extension-manager>`_.
+
+Depending on the application, the user can find different extensions, the following sections describe each of them.
+
+Extensions can be launched in standalone mode from the console or from a python script. This is described on each extension section.
+
+Project extensions
+==================
+
+Project extension apply to all extensions that are visible to all kind of AEDT applications.
+
+.. grid:: 2
+
+   .. grid-item-card:: Import Nastran
+            :link: pyaedt_extensions_doc/project
+            :link-type: doc
+
+            Import Nastran or STL file in any 3D modeler application.
+
+.. toctree::
+   :hidden:
+   :maxdepth: 2
+
+   pyaedt_extensions_doc/project
+
+HFSS extensions
+===============
+
+
+HFSS 3D Layout extensions
+=========================
diff --git a/doc/source/User_guide/index.rst b/doc/source/User_guide/index.rst
index cd8782d6a74..f687c34ea27 100644
--- a/doc/source/User_guide/index.rst
+++ b/doc/source/User_guide/index.rst
@@ -18,6 +18,13 @@ For end-to-end examples, see `Examples <https://aedt.docs.pyansys.com/version/st
             
             How to launch AEDT and create a project.
 
+   .. grid-item-card:: Extensions
+            :link: extensions
+            :link-type: doc
+            :margin: 2 2 0 0
+
+            How to use PyAEDT extensions.
+
    .. grid-item-card:: Modeler
             :link: modeler
             :link-type: doc
@@ -72,6 +79,7 @@ For end-to-end examples, see `Examples <https://aedt.docs.pyansys.com/version/st
    :maxdepth: 2
 
    intro
+   extensions
    modeler
    mesh
    setup
diff --git a/doc/source/User_guide/pyaedt_extensions_doc/import_nastran_ui.png b/doc/source/User_guide/pyaedt_extensions_doc/import_nastran_ui.png
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index 00000000000..cbfdeb41d41
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diff --git a/doc/source/User_guide/pyaedt_extensions_doc/project.rst b/doc/source/User_guide/pyaedt_extensions_doc/project.rst
new file mode 100644
index 00000000000..48c17798f69
--- /dev/null
+++ b/doc/source/User_guide/pyaedt_extensions_doc/project.rst
@@ -0,0 +1,49 @@
+Import Nastran
+==============
+
+Import Nastran or STL file in any 3D modeler application. The user can also preview the imported file and decimate it before import it.
+
+User can access the extension from the icon created in the Automation tab through the extension manager.
+The following image is the extension user interface:
+
+.. image:: import_nastran_ui.png
+  :width: 800
+  :alt: Import nastran UI
+
+User can launch the user interface from the terminal:
+
+.. code::
+
+   SET PYAEDT_SCRIPT_PORT=50051
+   SET PYAEDT_SCRIPT_VERSION=2024.1
+   python.exe path/to/pyaedt/workflows/project/import_nastran.py
+
+The available arguments are: file_path, planar, lightweight, and decimate. These arguments can be obtained from the help:
+
+.. code::
+
+   python.exe path/to/pyaedt/workflows/project/import_nastran.py --help
+
+For example, you can pass the input file as an argument, and in this case the user interface is not launched:
+
+.. code::
+
+   export PYAEDT_SCRIPT_PORT=50051
+   export PYAEDT_SCRIPT_VERSION=2024.1
+   python.exe path/to/pyaedt/workflows/project/import_nastran.py --file_path="my_file.stl"
+
+Fianlly, the extension can be used in a python script without the user interface with the following code:
+
+.. code:: python
+
+    import pyaedt
+    import os
+    from pyaedt.workflows.project.import_nastran import main
+    file_path = "my_file.stl"
+    hfss = pyaedt.Hfss()
+    # Specify the AEDT session to connect
+    os.environ["PYAEDT_SCRIPT_PORT"] = str(hfss.desktop_class.port)
+    os.environ["PYAEDT_SCRIPT_VERSION"] = hfss.desktop_class.aedt_version_id
+    # Launch extension
+    main({"file_path": file_path, "lightweight": True, "decimate": 0.0, "planar": True, "is_test": False})
+