I had to dispose of my old computer monitor (A) as it stopped working. I bought a new one (B) to replace it. How do I update this data in turbo tax online?

I had also  bought a computer when I had originally bought the computer monitor (A). That computer is working fine but in turbo tax online I am only seeing one class that pools both items - Class 50. How do I ensure the correct information displays? I got zero dollars this year from disposing the monitor (A). I had to buy another monitor to replace it.