Hi.
I need to share the bandwidth between main router and then 4 others connected to the main one is this possible ?
All of the routers have isp static ip addresses.
Is there a tutorial somewhere.

You could use Bandwidth Limit to share bandwidth between multiple clients / routers - you'd just set each one to a quarter of the total bandwidth.

This guide covers how you'd set this up. Since the IP addresses are static IPs (I assume static Internet IPs?), you may need to tick "IP Routed Subnet" for the bandwidth limit to apply to those IPs.

Thanks for the link which does help