Getting paid for spreadsheet for massive corporation

I work for a multi billion dollar global corporation. At this corporation there are local distribution centers dotted all around the world, and at each location there are union labor workers and non-union management workers. I am a labor worker and every day I watch my supervisors struggle through using an excel sheet to manage who does what job. They can even understand the most basic functions, dispite me sending them how to videos.

I took it upon myself to make an overly complicated spreadsheet for them, just as a challenge for myself. The work I've done will cut what takes them like an hour to do, down to at most 30 mins if not far less. I'd like to present it to them, but I'm not going to give it away for free. All the work I've done has been on my own time on my own equipment, so there is no issue there.

What would be the best process is getting paid for such work?