Hello Jaros
Is the MPLS network yours (i.e. you created it with your gear) or is it something that is provided to you from a Service Provider?
You can absolutely create multiple VLANs across your VPLS network, It is a little tricky have you read the Concepts guide on VPLS yet? That will give you a good start in understanding the concepts and the commands that are needed. I will start there and either come back to the Hub for fine tuning the solution or look within our Knowledge base to see if there is already a post on creating VLANs over VPLS network.
Thanks
P