If you'd like to sort campaigns into groups. (making it easy to fetch all campaigns related to a specific product, language or anything else you think of), just do this:
1) Click the "Campaigns" menu to view them all, hit the options button on the upper right corner of the page and select "Groups".
2) A window will pop up. Type in the group name and choose whether you'd like all campaigns assigned to it to have a social sharing bar (it'll help your contacts share your campaigns on Facebook, Twitter, etc.). Click the "+" button and do the same for any other groups you wish to create.
3) Close the window. Select the campaigns you want to assign (by ticking the checkbox to their left), click the options button on the upper right corner of the listing and choose "Assign to a group".
Done ! You can then use the campaign search bar to single out those belonging to a specific group. In addition, when creating or editing a campaign, you can also assign it by clicking the "Options" button.