You can set any virtual machine to start when you start Fusion.
You can set any number of virtual machines to start when you start Fusion. You must select this option in each virtual machine that you want to start when Fusion launches.
Setting a virtual machine to start when Fusion starts can be useful if you have many virtual machines that you want to start. You might want to start a virtual machine when Fusion starts if you use a laptop to run one virtual machine that you always want to resume every time you start Fusion.