Great answer John, many thanks for that.
I have Pro, and have just tried the nested way but for some reason vegas crashes around 8% into the render because of an ‘exception’! I use nested projects quite often in smaller commercial jobs, where films are normally only 10 mins long, but have never tried to render 1.5 hours of nested projects before – computer doesn’t seem to like it. Anyway, that’s another problem for another forum (maybe). It will probably all be ok tomorrow, such is the nature of computers…
🙂