Mikrotik bainwidth rate reservation

I need some adwise, in how to realize this scheme.

All traffic is aprox 300 Mb/ps, need a rule, in which I can put some IP addreses, to reserv them about 2 mb/ps, so they allways has 2 mb/ps; but if traffic is healthy, they use more than 2 mb/ps but not less than 2 mb/ps.

What kind of features used to do this in RouterBoard ?
bainwidth.png

You would use a queue tree with leaves with the appropriate rate limits and priorities set so that the leaf those IPs would be in are least likely to drop packets.

Thanks will try,
But as I understand it affects to all users in networks ?
Or I can do this only for those IP’s which I mark example PC1 = pcq download/upload, PC2 = pcq down/upl?

Queues fire on packet marks.