It's simple
1. Traffic management > Traffic shaping > Pipes
Make two pipes (ex, lan_up and lan_down) with grouping by source IP, total limit equal to wan speed, group limit = your limit for users.
Two pipes are required because you will have possibility to control bandwidth of both directions separately.
2. Traffic management > Traffic shaping > Pipe rules
Add rule lan/lannet wan1/all-nets, forward chain = lan_up, return chain = lan_down
Thanks for the help Dan but sorry if I have a lot of queries.
Configuration:          Version 25
Firmware Version:     2.26.00.06-12649
                             Sep 23 2009
Our Internet speed are:
1st ISP is up to 2mbps static IP
2nd ISP is up to 2mbps dynamic IP
General >Precedences:     Minimum=0     Default=0     Maximum=7
Pipe Limit >Precedences:     Kilobits per second     Packets per second.
there's 7 boxes to input
Group Limit >Precedences:     Kilobits per second     Packets per second
also 7 boxes to input
What would I input here?
In the Pipe rule what will be the services I'm going to put here?