No official portable version exists from Valve.
Portable versions often omit bots to save space. Here’s how to add the famous : Counter Strike 1.6 Portable Download
Organizing a LAN party? Portable CS 1.6 is perfect. No official portable version exists from Valve
If you're interested in exploring more about Counter Strike 1.6 or looking for alternative versions, here are some additional resources: Counter Strike 1.6 Portable Download
writeconfig portable.cfg