Customize page without changing other pages

Hi all,

I'm sure what I'm trying to achieve is probably quite simple however I can't figure it out!!  I have created various tabs under Menu Bar: Network_TabMenu e.g:

https://orion.domain.co.uk/Orion/NetPerfMon/ContainerDetails.aspx?NetObject=C:9

https://orion.domain.co.uk/Orion/NetPerfMon/ContainerDetails.aspx?NetObject=C:8

How can I customize one page without it also changing the other page?  For instance if I click 'customize page' on the first page and add a resource into column 1 (e.g. Last 25 Audit events) the same resource will be added to the other page.

Any ideas?

Cheers,

Graham