what is best room design to use a sectional sofa

Oh, and here is that website for virtual furniture arranging: http://www.bhg.com/decorating/arrange-a-room/

A good sectional sofa is truly the centerpiece of any living room, but you have to be sure to have the living room to handle it. A great way to use a sectional is in a open concept room, to create a definition of space between a living room and dining room.
If you don't have that kind of living room, but a more traditional one, a sectional sofa is great when used in combination with an additional chair and great coffee table, to create a conversation area.
You can also take apart your sofa, and use it more as a traditional sofa with the extra sections used as chairs.
When I rearrange my furniture and I don't know how I want it exactly, I use the website, linked below, which allows me to rearrange on my computer before I even move one heavy piece of furniture.
Also click the product links below and you'll see some great ideas for arranging your furniture.