"I'm trying to get Intuit to add it into all of their software."

That's not what you asked here. You asked How To: "how in turbo tax (or other Intuit software) do I document that even though I had a $2,000 W-2g, I'm only table able on the net of $1,100?"

Since you are in the ProSeries Community, issues for enhancements would be posted in the Ideas Exchange, to be set a status by Intuit, then voted on, then implemented or not. Here:

https://proconnect.intuit.com/community/proseries-tax-idea-exchange/idb-p/603