I want to change the "bytes in" value so that I can simulate inbound traffic throttling.
That's not how this works. Netsh is just displaying the statistics of the network traffic on your pc. You could try disabling your NIC, or rebooting, that would reset the statistics, but that won't simulate anything.
Your question is what I refer to as an XY problem. Please read: https://xyproblem.info/ Especially the "What to do about it?" section.
You keep asking about "Y". Nine questions in total!
https://learn.microsoft.com/en-us/answers/questions/1195031/how-to-change-the-bytes-in-and-bytes-out-value-usi
https://learn.microsoft.com/en-us/answers/questions/1194563/what-is-minbandwidthweightaction-in-netqos-policy
https://learn.microsoft.com/en-us/answers/questions/1194136/how-to-give-random-bandwidth-value-using-windows-p
https://learn.microsoft.com/en-us/answers/questions/1193395/how-to-install-smbbandwidthlimit-in-powershell
https://learn.microsoft.com/en-us/answers/questions/1192461/how-to-assign-a-bandwidth-value-to-the-network-tra
https://learn.microsoft.com/en-us/answers/questions/1189737/how-to-limit-bandwidth-to-a-certain-value-using-cm
https://learn.microsoft.com/en-us/answers/questions/1194563/what-is-minbandwidthweightaction-in-netqos-policy
https://learn.microsoft.com/en-us/answers/questions/1186772/how-to-limit-bandwidth-for-windows-using-command-l
https://learn.microsoft.com/en-us/answers/questions/1186725/how-to-limit-bandwidth-of-inbound-traffic-using-co
You still haven't told us what "X" is. Obviously its related to network bandwidth, but we have no background on the issue. You have accepted the answers on several of those questions where other users have tried to help you. Did those answers not work?
Start at the beginning. Explain what the network problem is. Describe your environment. Explain why you want to limit bandwidth. Explain what you've tried and how you are testing. Explain what doesn't work.
This forum gives you free access to a lot of users with a lot of experience. But we can't help you if you don't give us the big picture of what your problem is.