UPDATE: Implementation Guide: SUM values if font is bold – Google Drive Spreadsheet

This is second part of the guide of how to implement custom function into Google Drive Spreadsheets.

UPDATE: If you would like to easily update calculated values from this custom function, than you have to go following way: http://stackoverflow.com/questions/17341399/refresh-data-retrieved-by-a-custom-function-in-google-spreadsheet – I just followed mentioned guide there and I have extra button in menu now, which allows me easily refresh all values which were calculated by my custom function.

I have been receiving many questions how exactly use the script mentioned in previous part of this guide so I decided, that it would be better to write it down incl. screenshots.
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