Any computer that has an agent installed and is connected to the internet will count as a licensed asset. When an asset no longer needs to be tracked, you can preserve the historical data in your account by uninstalling the agent from that machine. Once the agent is no longer reporting, you can simply set the status to disposed or delete the machine from your account if you want to completely remove the data. In Samanage 'disposed' assets do not count against your licenses. Disposed assets will also not contribute to your samanage software contracts.
If this is a scenario where you no longer have access to the asset and the agent is still running, then send an email to firstname.lastname@example.org along with your account name and the name or serial number of the machine so that we can stop it from reporting from our end.