Can I deauthorize a computer form itunes in my iphone without removing it from my account

Hello wsalinas04,

Thanks for posting your question. We see you want to know about deauthorizing a computer, and we have a few resources that should assist.

First, to deauthorize a computer, you would need to do that directly from the computer using these steps: Authorize or deauthorize your computer for iTunes Store purchases

"Deauthorize a computer

1. On a Mac, open the Music app, Apple TV app, or Apple Books app. On a PC, open iTunes for Windows.
2. From the menu bar at the top of your computer screen, choose Account > Authorizations > Deauthorize This Computer.
3. Sign in with your Apple ID.
4. Choose Deauthorize."

For your second question, this has some information that may help: View and remove your associated devices for purchases

Take care!