ticket to the ticket

Hi, everybody !

I'm playing freeroll tournaments for some time (777 and Betfred) and now I'm starting to win tickets. They are in form: Mega X-Y. When I use them and win again I get some other tickets with different numbers.

Is there a place somewhere where I can get description of this structure ?
It'll be interesting to win some money too at the end of the road

Another thing.
Sometimes some monetary value is attached to these tickets.
Is it convertible or is these numbers just for fun ?

I understand that all this can be different for different rooms, but seems like there is some generic structure and rules to it.

I believe the mega-series satellites eventually end up at the final where you can win a package valued at 1500 euro. So I don't think there is any real actual cash to be won in these.