Single WordPress Install, But Post To Multiple Subdomains

I have looked all over for a way to do this to no avail. I have gotten Mu to work but its intended for building all separate blogs and some plugins do not function correctly as well as themes etc.. I a website on domain.com and 50 subdomains set up that are state specific like colorado.domain.com. I need to figure out 2 things.

1. I need to figure out how to use wordpress as a content editor per site by adding includes or snippets of code like footer etc and past the include in all my current sites to edit everything at once.

2. I need to figure out how to get the one install to talk with each sub domain as well as the template etc…

I have one main site offering information on multiple products for all 50 states but are all on the same domain just different content on each sub domain per product.

Let’s say I offer information on Home Repair, Credit Repair, Auto Repair in all 50 states.. My main site will be on domain.com, if they select credit repair, it goes to creditrepair.domain.com which has content on credit repair and if they choose Colorado, it goes to colorado.creditrepair.domain.com, which has facts on credit repair in Colorado. I have these sites up and running now, I just need to figure out a way to build in the content includes into wordpress to talk to all the different domains so all I would have to do is use wordpress as a back end for content. All the pages on all the sites are html…

Any help appreciated, I will even pay or donate for an easy solution or simple instructions.

Thank You,

Joe