I am not exactly sure what you are asking here… If a value is an int or float then you could do a branch and test to see if it is higher or lower or at a certain point and set a bool based on that (That is what I think you should do here.) , that is really the only way to create a variable a bool without it already being a bool.
Im looking at the animation demo level the unreal put out in 4.8, and am trying to trigger different stages of the animations graph with bool variable their tiger boxes or key triggers. the problem is i cant communicate with the class blueprint which will be what switches between animations in the level.
What you do is “Get reference from self” Then drag off the pin while you right click, and “Type the name of your variable” example. Isinair?. You will then get a target variable or bool. whatever you created.