Single File to connect to more then one data source: Is it possible?

Hello everyone!

  I just got into the world of Power BI and I think I have a difficult task. I need to find a way to connect more than one dataset to only one Power BI file. I searched a lot, but couldn't find something like this. There is a post wich answer this, but after looking into the correct answer, it's not what I want.

Here's the forum link to the topic:

http://community.powerbi.com/t5/Service/SaaS-and-Multi-Tenancy-Using-the-same-report-for-multiple/m-p/84741

I literaly need a single file of Power BI to connect to more than one client data source. Anybody know if it's possible?