Hello Mates,
I am here again with some new Questions. 
Hope i will get it’s answer soon.
Q . 
How to get Bandwidth Usage details?
how can i get/save my networks computers daily Bandwidth usage details up/down ?
Thanks In Advance
The easiest way is first to make simple queue for every used IP address (Queues → Simple Queue), and then draw graph (tools → graphing → queue rules). You can check the graphs at http://router_IP/graphs
However, this is useful only if your computers are using static IP addresses.
Traffic Flow gives much more usable informations and it is really worth to give it a try!
how to enable ip traffic-flow ?
Did you read the link at all? The example shows how to do this.
http://wiki.mikrotik.com/wiki/Manual:IP/Traffic_Flow#Examples
It’s enabled now,
how is it work and how to check it now? 
Get a NetFlow connector to send data to. If you need general information please use Google or Wikipedia.
how?
please help me to setup, i will be very Thankful to you always.
http://www.ntop.org/news.php
http://nfsen.sourceforge.net/
These are two free collectors you can use. Otherwise search for a netflows collector on the internet. You will likely need to set up a separate server and work out from there. There are several free options, and several pay for options. It all comes down to what do you want, what kind of features, and how much time and effort do you want to put into getting it going.
Sorry for writing if topic from 2011, but has someone managed to store simple queue counters after reboot?
unfortunately not, there was a script in the script repository where someone did something similar. He ran a scheduled script to grab the usage data from the simple queues and entered them as a comment for each queue every few minutes. But imo it wasn’t a good solution, it was fairly messy and prone to error.
I tried using netflow but I can’t quite figure out how to use the 3rd party collectors properly, so I gave up. I just don’t understand why they have to delete all the queue stats on reboot, why can’t they be stored, specially total usage. Logging has the option of storing to memory or disk, I don’t see why queues don’t have that option.
Store stats of queues on disk has been added to feature request by MT staff. Let’s wait, maybe they add that.
yeah, hopefully sometime in 2020 
Only 6/7 years Maybe new The Dude will be released faster…