I wrote a few odbc articles using ODBCCONF in my blog, so I edit them because ODBCCONF will be removed; read https://docs.microsoft.com/en-us/sql/odbc/odbcconf-exe
Using Powershell Add-OdbcDsn is much easier
PS> remove-OdbcDsn -name DB01 -dsntype User
PS> Add-OdbcDsn -name DB01 -DriverName
"Oracle in client12201" -DsnType "User"
-SetPropertyValue @("Server=DB01")
PS> Get-OdbcDsn
Name : DB01
DsnType : User
Platform : 64-bit
DriverName : Oracle in client12201
Attribute : {Password, StatementCache, ...}
PS> remove-OdbcDsn -name DB01 -dsntype User