Can i have 2 EXTERNAL style sheets in one website?

(like i link to one sheet for my main pages, and i link to another for my subpages?)

Yeah, you can have 2, Just link to each one like you normally would:
<LINK href="yoururl.css" rel="stylesheet" type="text/css">
<LINK href="yoururl.css" rel="stylesheet" type="text/css">

Hey,

Just know that the more external style sheets you use, the longer the page will take to load.

It might not be an issue with small web sites, but when you have 100s or 1000s of web pages then it might become an issue. You just might want to keep that in mind. What you would do then is simply to use a single externel style sheet for every page. There are tons of tools you can use to compress the style sheet to make it load even faster. Now it might sound like a very hard way to keep everything in track. But really it's not. When you create the site you still create seperate style sheets. Then you use software to bring them all together as a single style sheet that you then upload to your site. Well hope that makes any sense. ;)

Take Care,

Will