Question: How do you make a function call another function?

People:

I wrote a Maple 15 worksheet containing a function that calls two other functions defined earlier in the worksheet.  The main function didn't work, so I replaced one of the functions that was called, by cut-and-pasting its definition into the main function.  This is obviously inconvenient because I want to alter the function that I cut-and -pasted and whenever I do it I will have to cut-and-paste again.  It also detracts from the readability of the document.  Now the main function works, even though it calls the other subfunction.  Is this a bug?  How can I fix it?  Can I fix it by writing a procedure?  I write functions all the time, but I've never writtten a procedure.

I looked at the "similar questions" listed and didn't see any like mine.

Greg