Hello,
The best thing is to create a separate account (email password) for all your clients.
You will need to upload all resources to each account.
In the near future will allow you to copy / paste between Studios.
So you will be able to open mutliple Studios and copy resources (like timelines, Scenes etc) between them.
We also support public resources, when you mark a resource as public, EVERYONE that uses our system can access it. So as long as you do not care that everyone case see it, you can take advantage of marking resources as public.
Regards,
David.