SAP Product Lifecycle Management
SAP Library (Online-Help)
http://help.sap.com/ -> SAP Business Suite -> SAP Product Lifecycle Mgmt.
The documentation of PLM components that are delivered with SAP ERP can be found here: http://help.sap.com/ -> SAP ERP -> SAP ERP Central Component (-> SAP ERP Enhancement Packages). As of Enhancement Package 4 for SAP ERP you can find the PLM documentation grouped under SAP ERP Central Component -> Logistics -> Product Lifecycle Management (PLM).
Master Guide for SAP Product Lifecycle Management
http://service.sap.com/instguides -> SAP Business Suite Applications -> SAP PLM
Security Guide for SAP Product Lifecycle Management
http://service.sap.com/securityguide -> SAP Business Suite Applications -> SAP PLM
Document Management
Document Management
http://help.sap.com/ -> SAP ERP -> SAP ERP Central Component -> SAP ERP Cross-Application Functions -> Cross Application Components -> Document Management
SAP Easy Document Management
http://help.sap.com/ -> SAP ERP -> SAP ERP Central Component -> SAP ERP Cross-Application Functions -> Cross Application Components -> SAP Easy Document Management
DMS Connector for KM
http://help.sap.com/ -> SAP ERP -> SAP ERP Central Component -> SAP ERP Cross-Application Functions -> Cross Application Components -> Business Package for DMS Connector for KM
Engineering Change Management
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Logistics General (LO) -> Engineering Change Management (LO-ECM)
Product Structure
Material Master
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Logistics Basic Data (LO-MD) -> Material Master (LO-MD-MM)
Bill of Material (BOM)
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Production Planning and Control (PP) -> Basic Data (PP-BD) -> BOMs (PP-BD-BOM)
Routing
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Production Planning and Control (PP) -> Basic Data (PP-BD) -> Routings (PP-BD-RTG)
Integrated Product and Process Engineering (iPPE)
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Production Planning and Control (PP) -> Basic Data (PP-BD) -> Integrated Product and Process Engineering (iPPE)
Variant Configuration
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Logistics General (LO) -> Variant Configuration (LO-VC)
cFolders
http://help.sap.com/ -> SAP ERP -> SAP cProject Suite -> Design Collaboration with cFolders
cProjects
http://help.sap.com/ -> SAP ERP -> SAP cProject Suite -> Collaboration Projects
SAP Portfolio and Project Management
http://help.sap.com/ -> SAP Business Suite -> SAP Portfolio and Project Management
Security Guide for SAP PPM
http://service.sap.com/securityguide -> SAP Business Suite Applications -> SAP PLM
SAP Recipe Management
http://help.sap.com/ -> SAP ERP Central Component -> Logistics -> Product Lifecycle Management (PLM) -> Recipe Management (PLM-RM)
---- Find documentation on SAP PLM components.