You can create a collection of SIM cards, that is used in the same area or has other relations. First you go to Collections Menu. From there you select Create Collection from the Action Menu and follow the steps on the screen.

As you can see from the video you can always at a later stage add additional SIM Cards to your collection. All you do is to select Edit Collection from the Action menu, Find the SIM Cards you would like to add from Remaining SIM Cards and press Save.