Multiple files

Using Arduino Programming Questions
#1

I want to split up the main .ino file. Nothing I've tried has worked.

I've tried creating a foo.ino or foo.c file in the sketch folder. If I then drag it into the IDE, it asks me if I want to replace the existing foo.X file, which when I click 'Yes' then deletes that file from the sketch folder and I'm still left with just the one tab with my primary .ino file.

If I try creating the foo.ino in the sketch folder then selecting "file > open", it says that foo.ino needs to be in its own sketch folder. If I create foo.c in the sketch folder then select "file > open", it says "Processing can only open its own sketches and other files ending in .ino or .pde.

I've tried searching the net, but I'm getting a lot of 404 errors and unhelpful blog posts.

Assistance is appreciated!
Thanks

#2

Ah I found the answer - I didn't see the little down arrow to the right of the tabs on the very right of the window, there's a "New Tab" option, I made a .C file

#3

I've tried creating a foo.ino or foo.c file in the sketch folder.

OK, now quit the IDE and start it again. When you open your program you will find a foo.c tab in the IDE window.

#4