A-Z,
Welcome to the forum and to Band-in-a-Box for Mac.
I use the Windows version of Band-in--Box but, for some of the questions you asked the answer is the same for both versions.
What if I just want it (a printed lead sheet) to end on a bar without it generating an ending bar?
. Band-in-a-Box always divides a song into three parts: intro, chorus and end. It's always going to print the three parts so it will always print an end.
I want it to end on a NO CHORD N.C.
. Band-in-a-Box always prints any chord you enter, even if it's a no chord.
The only way around the program constraints is to use a different program.
+++ Musescore +++ is a free, open source music composition program available for Windows, Mac and Linux.