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+<p>
+  Adding subsystems to the shelf can be done in two ways:
+  <ol>
+    <li>via the context menu on the shelf</li>
+    <li>via the context menu on a subsystem</li>
+  </ol>
+</p>
+<h2>Adding subsystems via the shelf</h2>
+<p>
+  To add one or more subsystems to the shelf from the current pipeline, do
+  the following:
+  <ol>
+    <li>Select one or more subsystems on the current pipeline</li>
+    <li>Right-click on a category in the shelf and choose 'Add selected subsystems'</li>
+  </ol>
+</p>
+
+<h2>Adding subsystems via the subsystem context menu</h2>
+<p>
+  To add a particular subsystem to the shelf, do the following:
+  <ol>
+    <li>Select a category in the shelf</li>
+    <li>Right-click on a subsystem on the current canvas and select 'Put on shelf'</li>
+  </ol>
+</p>
+
+<h2>Using subsystems from the shelf</h2>
+<p>
+  Subsystems can be dragged from the shelf to the current pipeline. You can also
+  right-click on a subsystem in the shelf and choose 'Add to pipeline'.
+</p>
+<p>
+  Hovering the mouse over a subsystem in the shelf reveals some information about the subsystem:
+</p>
+<br>
+<br>
+  <img src="images/lwb_shelf_subsystem_tooltip.png" alt="Shelf subsystem tooltip" border="3">
+<br>
+<br>
+<p>
+  If you want to edit or rename a subsystem from the shelf, add it to a pipeline, then make the 
+  required edits, then re-add the edited subsystem to the shelf. When satisfied, you can remove
+  the old subsystem from the shelf by right-clicking on the subsystem and choosing 'Remove from shelf'.
+</p>
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