Help On Optimizing A Dynamic Website

Hi
I hope I would be able to explain wat I m looking for..

I m reviewing a website of company having large travel agent network in which they have different agents in the diff parts of country. The website has separate section for each agent having service 7-8 pages. All the pages in these sections are dynamically driven pages (e.g. website.com/service1.aspx?a=agentname)which works as base/core. Each time value of ‘a’ changes, only header of the page is changed but rest content remains same. There are some 40-50 such agents which means as many replication of these service pages.
Now core company is trying to make separate domain for each such agent with content driven from respective section of core website through frames.

So how should v go about it? And what If we need to optimize one particular agent’s website, how should we go about it?
Any help?