For example, you can define a plan variable called ExecutionTime. Then you can specify the value (in time) that you want a plan to be executed. You define a variable at a higher level (usually within a plan) and then reference it within a demand. When the value of a variable changes, all demands and plans that reference that variable automatically use the new value.
If you have the Change Administrator role, you can add, delete, or modify local variables that are referenced by function arguments and other variables.
See also