The specification tree and other machining features views are displayed in several tabs at the top left corner of the authoring window. Press F3 to hide/show them.
See Specification Tree
See Using the Manufacturing View.
See Creating Machining Processes with Knowledge
See Creating a Machine Configuration View
In Machine Programming, resources, product, and process elements are identified in the specification tree by means of following symbols.
See Using the PPR Context
See About Implement Links and Other External Links