This more of it doesn't work like the IDE and is another stumbling block in its use.

When you add a new sketch item, you are given the option of Ino, C, or Cpp.  The closest approximation to the Arduino IDE add tab item is C or Cpp.  When I add one, it creates a header and source file (c or cpp).  BUT, what I find is that these do not correctly reference global objects listed in the primary Ino file.

When you want to split a large Ino, that requires different pieces reference a "global" (yeah, I know, generally not good, but this is Arduino, not some OS source) then you just include the other "tab" files after the global and it works.  But I could not get this too work if the C/Cpp existed.  If I deleted it things seemed to work fine.

I know the right solution is to avoid globals, pass references to objects, but this gets messy passing the many singletons like objects that Arduino seems to be based on, like many of the library classes.