Dynamic variables allow you to use temporary variables that are limited in scope. These variables are great if you want to share data between a limited number of tasks and do not need to access the variable outside of those tasks. Dynamic variables can be created by clicking the circle to the right of the variables field and then selecting “(Dynamic)”:

After the dynamic variable has been created you can then type the name of the variable.

The dynamic variable will now be used within your tree. The dynamic variable will have the same value for any fields that reference the same dynamic variable name. The name is case sensitive and should not be the same as a local variable within the tree.