Is there a way to install multiple operating systems into the mobile hard drive?

[思无邪]

I changed my mobile hard drive into Ventoy，and when I ran Ventoy to select multiple operating systems, I wondered that if I could only run operating system without installing it into my physical computer?Or could I just installing operating systems into my mobile hard drive without affecting other data? 
Anybody could help me? Thanks!!!!!!

有没有中国老铁能教教我，我想直接运行操作系统但是不安装到我的物理机上，不知道是否有这种操作能够满足我的需求。或者是否可以将多个操作系统安装进我的移动硬盘中？铁子救救我！