All the steps for adding the multiple option positions are covered in our article Adding multiple Call & Put Options Payoff Functions in a step by step fashion. However, if a picture is worth thousand words, a video is worth a million. So here are the same steps and procedures in a video format for easy understanding of addition of various call and put options.
Please note that due to software as well as you tube video length limitation, I have to break this into 2 parts, See part I first and only after that move on to part 2:

Video-How-to-Add-Multiple-Option-Positions-Part-1

Video-How-to-Add-Multiple-Option-Positions-Part-2

Detailed Example with Payoff functions demonstrating how to add Multiple Option Positions to arrive at a net payoff function-Part II

Addition of Payoff Function Summary:
Addition of Payoff Function for multiple option positions isn't that difficult or complex as it may appear. Only thing an option trader needs to be aware of the steps which are of prime importance. I've listed the steps for adding multiple put and call options in both the site articles as well as the video. Readers may refer to either of them for understanding the concept. Contact us if (training (at) futuresoptionsetc.com ) if you want any special detailed session on option trading for yourself or your organization.