The reasons we offer to use Campaign groups can be found here:
For now we can say that a campaign group will work as a banner rotator between campaigns, in this case, we can ensure you to filter the traffic and displaying the offers that will work on the country your visit is opening the site
For this the only requirement is to have 2 or more campaigns a banner of the same size
To create a campaign group you need to Select “Campaigns” from the main menu
Select “Campaign Group”
Click: “New Campaign Group”

On the General information Panel type the name desired for this Campaign Group (Banner and link Rotator)
Select the “Banner Size” for this campaign group
Click “Save Data” button
The campaigns that have banners that match the banner size selected will get displayed on the “Campaigns List Field”
Select the campaigns needed with the arrows on the middle (The campaigns on the right side will be the ones included in the banner and link rotator)
Click “Save Data” button
the campaign group will be ready to use
Check the “Campaign Group Script” panel
select and script code, and you will be ready to use it
The Banner Tab Will get the code of the image and the link (will be rotating according to the IP of the visitor)
The Tracking Tab will be the code you will need to upload to the FTP of your site to cloak(Hide) your affiliate link
The Contextual Tab will be link that redirects to the campaign