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diff --git a/src/BuildPlugin/doc/subShapesFeature.rst b/src/BuildPlugin/doc/subShapesFeature.rst
index 174361718..d1b767232 100644
--- a/src/BuildPlugin/doc/subShapesFeature.rst
+++ b/src/BuildPlugin/doc/subShapesFeature.rst
@@ -2,9 +2,51 @@
 Sub-shapes
 ==========
 
+The feature **Sub-shapes** modifies the selected entity by creating a non-manifold topology. It gives the possibility to:
+
+* add/remove vertices lying on edges of a wire;
+* add/remove edges and vertices lying on a face.
+
+To create Sub-shapes in the active part:
+
+#. select in the Main Menu *Build - > Sub-shapes* item  or
+#. click **Sub-shapes** button in the toolbar
+
+.. image:: images/feature_subshapes.png 
+   :align: center
+
+.. centered::
+   **Sub-shapes** button 
+
+The following property panel appears.
 
 .. image:: images/SubShapes.png
   :align: center
 
 .. centered::
-  Create sub-shapes
+  Sub-shapes property panel
+
+Input fields:
+
+- **Shape** panel contains the shape to be modified. The shape is selected in 3D OCC viewer or object browser. For today it has to be a wire or a face;
+- **Sub-shapes** panel contains the list of sub-shapes which are already included into result. A sub-shape can be deleted from the list or the list can be extended with new shapes selected in the view.
+
+**TUI Command**:  *model.addSubShapes(Part_doc, shape, sub-shapes)*
+
+**Arguments**: 1 part + shape in format *model.selection(TYPE, shape)* + list of sub-shapes in format *model.selection(TYPE, subshape)*.
+
+Result
+""""""
+The result replaces the original shape with its copy with added/removed sub-shapes.
+
+.. image:: images/CreateSubShapes.png
+   :align: center
+
+.. centered::
+   Sub-shapes
+
+**See Also** a sample TUI Script of :ref:`tui_create_subshape` operation.
+
+
+  
+