EViews.com

i have run a regression model that contains 6 different variables. Howevere there is a hypothesis that this regression may be different when we change our sample, breaking it up by a dummy variable, in my case used cars where 0=new car 1= used car. how can i run a regression with just used car=0 so that all my other varibles just reflect when used car=0?
this is to do a Chow Test
Help would be greaty apreciated

Look up Factor Breakpoint Test in the manual - I believe it does exactly what you want.