On the next page, Select "Product1" source folder and click Add Folder....
In New Source Folder dialog, type "src" in the Folder name field.
Click Advanced. Check Link to folder in the file system.
Click Browse.... and choose the "JavaSourceFiles" directory in "Product1".
Click again on Add Folder....
In New Folder dialog, type "src-common" in the Folder name field.
Click Advanced. Check Link to folder in the file system.
Click Browse.... and choose the "JavaSourceFiles" directory in "CommonFramework".
Working with build paths
Creating a new Java project
Creating a Java project with source folders
Creating a new source folder
Using the Package Explorer