Set up sql server locally in office laptop

can we add local server or local instance in office laptop where sql is already installed.?I need this local server for personal use only.If yes, Let me know the process.Thanks

It is possible that on your laptop only SQL Server Client Tools are installed, or it could be that client tools and SQL Server Database Engine are installed. If you have only client tools installed, you can install SQL Server Database Engine locally (assuming your hardware and software specifications are compatible with the version that you want to install). If you already have an instance of the database engine installed, you could still install another instance, but that will be a named instance.

You can launch SQL Server configuration manager (from the sql server programs group) to see what is installed on your laptop.