Hi
There are multiple ways to move the transports into SAP system which are all based on the requirements and I think more importantly on the volume of the transports.
SOLMAN CHARM is definitely one method to go . Also 3rd party tools like Transport Express provides some additional features to manage the transports in the landscape.
In many place , simple OS Level scripts can do the task . Also in some of the clients , I have seen the import job scheduled in the system which enables the automatic movement of TR into the NON PROD system once approval is obtained from the business.
So in a nutshell - you have multiple options and it depends on your requirement
Thanks
Rishi