I have copied and paste the Bootstrap started layout into a new DW doc, but the code is all on one line.
How can I set it, so it pastes downwards and not all on one line.
I'm not sure where you're copying from initially, as to what would cause a paste to come in as a single line of code, but after pasting your code see if hitting Edit > Code > Apply Source Formatting helps.
Did you paste from a minified script?
Instead of copy & paste, use File > SaveAs > new_filename.html
Yes that's great thanks...