How do I create a random global variable?

Hi how do I create a random a global variable to be used in creating an object?

you cant make the global variable random when you first add it to the event sheet but once added you can then set it in the events ...

https://goo.gl/jA9Gvt

u can add a global variable , and set on start of layout or when u character needs to be created to a random number, global variables cant be random by default as RamPackWobble Said

Thanks! It helps me a lot