I have devised a some custom functions as required for my daily office work!
I think I should form a single addin file for the same.

Does an such addin needs to have such functions' codes be typed:
1. In the worksheet code; or
2. Behind the workbook code; or
3. Be inserted in a single module; or
4. Separate modules for each of the function should be devised and maintained?

Thanx in advance!