how to generate multiple css files automatically ?

but i cant know how to do this because it can be generated automatically

i want to generate multiple files from 1 file like i want implemented the class in file then it generate automatically multiple files like for IE8,IE9,FIREFOX,CHROME AND SO ON........ for every browser i have html and css editor but that cant generated the multiple files for every browser so i want to generate multiple files automatically so help me how can i do this ???

ii have 1file (1.css)
body
{
border-right: thin groove;
border-top: thin groove;
border-left: thin groove;
color: blue;
border-bottom: thin groove;
font-family: Tahoma, Trebuchet MS;
}
h1
{
color:red;
background-color:Yellow;
font-family:Comic Sans MS;
}

now i want to generate 2 more files from this file and yes i want to generate the this text in another file
am explaining you all what i want see below..


i have html cum css editor which open the html and css file for example if i open the example.html file then i see the source code of that file then i changed the source code as that what i want to show in that page i have puted some value in the design area then it generate the new source code that i changed now i then i saved as 2 new file 1 example.css and other example.html now it generate only 1 file that i saved which can implemented on any browser but i have only css file which can implemented on browser . but we not sure that this is for IE8,IE9,FIREFOX,CHROME ETC. now i want to generate or automatically create multiple files like example1.css(for IE8) , example2.css(for IE9),EXAMPLE3.CSS(FOR CHROME) AND so on. from example.css ..... but this will be generated only automatically i dont want to write the example1.css ,example2.css files (because its created automatically )

if you got my problem then help me or tell me how can i do this ?
i have winform html cum css editor under .net