Use this tab to identify the engineering functions that you want
  to use for your product model. 
The engineering function structure is a conceptual
  level of product construction. Functions can be arranged in a structure. Each
  function on the bottom level can also have parts and the corresponding part
  structures attached.  The purpose is to organize the product structure so
  that it is familiar to multiple disciplines and to help with the construction
  of a product without having to immediately decide all its properties.
  
A function is the intended use of connected part(s). One part
  can be connected to more than one function, i.e., it can have several
  functions in the product structure.
The Characteristics functionality in
  Application Services can be used to handle technical data on each model function. The
  function characteristics are accessed with the Connected Objects option
  on the
  toolbar. Note that the functions themselves must be defined in 
Product Basic 
	Data/Functions.
Register Product Model Functions
Enter Product Model Functions
Enter Product Model
      Function Characteristics