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+.. _use_existing_page:
+
+**************************************
+Use Edges/Faces to be Created Manually
+**************************************
+
+The algorithms **Use Edges to be Created Manually** and **Use Faces to be Created Manually** allow  creating a 1D or a 2D mesh in a python script (using *AddNode, AddEdge* and *AddFace* commands) and then using such sub-meshes in the construction of a 2D or a 3D mesh. 
+
+For example, you want to use standard algorithms to generate 1D and 3D
+meshes and to create 2D mesh by your python code. For this, you
+
+#. create a mesh object, assign a 1D algorithm,
+#. invoke **Compute** command, which computes a 1D mesh,
+#. assign **Use Faces to be Created Manually** and a 3D algorithm,
+#. run your python code, which creates a 2D mesh,
+#. invoke **Compute** command, which computes a 3D mesh.
+
+  .. warning::
+     * **Use Edges to be Created Manually** and **Use Faces to be Created Manually** algorithms should be assigned *before* mesh generation by the Python code.
+     * Nodes and elements created in your script must be assigned to geometry entities by calling *SetMeshElementOnShape*, *SetNodeOnVertex*, *SetNodeOnEdge* etc. in order to be used by an algorithm of upper dimension.
+
+Consider trying a sample script demonstrating the usage of :ref:`Use Faces to be Created Manually <tui_use_existing_faces>` algorithm for construction of a 2D mesh using Python commands.
+
+.. figure:: ../images/use_existing_face_sample_mesh.png
+   :align: center
+
+**See also** :ref:`the sample script <tui_use_existing_faces>` creating the mesh shown in the image in a Shrink mode.
+