Thank you for the help in advance.
I'm used to developing asp.net web projects in visual studio for windows. With the new asp.net open source, I'm trying to develop on my mac. I already set my development environment and run the boilerplate. My question now is, can I import a traditional project developed in vs and in some way adapt to run and continue developing in Vscode and dmx?
Yes... So long as it's based on .Net Core.
.Net Framework 4.5, 4.7 etc is most definitely not cross platform and requires Windows and, more often than not, IIS to run.
So I suppose the real answer is, it depends.