I imagine, RouterOS also allows to translate one vlan id to other, change id. Seems this can be implemented by transferring traffic from one bridge to other, but how exactly it must be implemented?
The answers to all your questions were provided in this post…
http://forum.mikrotik.com/t/taged-and-untaged-simultaneously/128113/1
Your answer is not in current topic.
The answers are in the links provided. Use google translate if necessary.
Please dont spam my topic, I already reported about abuse.
Your question on a topic in a forum designed to discuss new features requested by users (not technical help for router configuration) is by very definition SPAM.
Please feel free to continue to report your self-inflicted spam crimes. 
I suggest you please post your topic in an appropriate forum and it will be answered quickly
This is surprise for me, because there is nowhere written that this forum category is only for “feature request”. I see here feature request also, but also questions. But I have also one big “feature request” that can be helpful for Mikrotik. I post it later. …btw. Are you forum administrator? I see you are from Canada. Mikrotik is from Latvia, my neighbour country.
Can you move my questions to right category?
I wish I could to save time and energy. No one will mind if you click on any post in this thread as being solved (then it will be effectively ignored from hereonin) and you can repost your initial question in either of the two other forums noted.
Well, is it only me seeing this as a description of current forum?
BETA Testing and Feature Suggestions for the next RouterOS release (ROS v7)
Moving to the ‘General’ section… Done