hi, how do you plot a 3d line chart similar in excel within mathematica??
I have to say that I completely agree with George.
Why would you want to do this? Except in the simplest cases, it obscures the patterns in the data, rather than making them clear. (See Tufte.)
Having said that, the solution provided in Kuba's link provides the solution. If you make a rotatable 3-D graphic, it would be possible for the viewer to see the relationships for themselves, given the ability to find a useful viewpoint.
I don't know if an answer may contain only a link...
You can take a look on StackExchange, I've already answered it in the topic: How to create Line Chart?
It is not exactly the same, the question there is a little bit broader, you probably do not want to provide spacings between lines.