You want to keep different departments apart

Basically, it is possible to create a separate subaccount for each of your departments. This can be especially useful if your departments are very large and several teams send SMS or if they launch different campaigs. These can then be marked with labels in the respective subaccount and thus be kept apart.
As the owner of the main account, you benefit especially from always having an overview of the number of SMS your departments send.
Especially for marketing teams a separate subaccount is recommended, because the clear accounting makes it easier to determine the ROI of your SMS campaign and the analysis function helps with evaluating the performance.