Solution

Method 1:

Select Project-> New Source.

A menu with a heading called "New" will appear.

Select "Coregen IP" to add a CORE Generator module

to the project.

Method 2:

From within the "Sources in Project" panel in the Project Navigator GUI,

select the project name and click the right mouse button.

Fromt the menu that appears, select "New Source".

A menu with a heading called "New" will appear.

Select "Coregen IP" to add a CORE Generator module

to the project.