If yous start CB and do:
File|New|Project..
then select:
Console application
then hit Go, and select C++ and then Next, you should get the Console application dialog. This is very far from being a great example of the GUI designer's art, but if you enter "xxx" (no spaces or anything ambitious) in the Project Title field (it of course is not the title, but the name) , and then hit Next, it should create a project and main file for you somewhere - exactly where is spelled out in the "Resulting filename" field.
This dialog drives me nuts every time I use it, but it does always create a main.cpp somewhere, at least on my Windows version of CB - I don't use CB on Linux.