DW Fluid grid layout question, adding a second layout?

beginner question:

 

so i've built index page in dw cc using fluid grid layout feature.

 

my site construction consists of

 

index.html page

boilerplate.css

layout.css

style.css

respond.min.js

 

the index page uses basic template tags such header, article, aside, h1-5, p, etc etc

 

the site working great , works responsively expect.

 

however, problem want add second html page site want have different layout, css style , fluid grid. consistent elements master index page header , navigation menu.

 

since styles of html index page linked master css pages how go adding different responsive layout same site without changes affecting master page?

 

for example if duplicate index page , start changing layout affects entire site, not want.

 

so thought need duplicate files , rename them like

 

page_2.html

layout_2.css

style_2.css

and 'boilerplate.css' , 'respond.min.js' not duplicated , stay are.

 

...but not sure if thats best practice duplicate files there method should considering? or on right track?

it's better build 1 layout entire site.  may decide not use elements on every page, primary design scheme should take consideration way bootstrap, skeleton , other rwd frameworks do. 

 

if necessary, can use embedded css few page specific style changes.  embedded css trump external style sheets. 

 

 

nancy o.

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