From within the Project Editor, you can create new Packages or add items already in the Project to an existing Package within the Project:
Once you have selected the items from with in the Project Editor, click the [Add To Package] button and choose your option. If you choose to add to a "New Package", the New Package form will open:
To view the items, click the [Items] button on the ribbon:
You can add/edit/delete Products and Labor Items via the ribbon:
If you chose to "Add to Existing Package", a form will open and allow you to choose which existing Packages in the Project you wish to add the items to:
Click here for full details on Packages.