By using global variables, you can write expressions (see Expressions) that you can later re-use by adding global variables to your expressions. This prevents you from having to write expressions every time you use them.
You can manage global variables by clicking Tools > Global Variables if you are a user with a role of at least Designer. A dialogue appears that allows you to manage global variables using the following buttons:
 | Click this button to create a new global variable. |
 | Click this button to edit the currently selected global variable. |
 | Click this button to delete the currently selected global variable. |
For each global variable, the following attributes can be set:
| Name | The name of the global variable; this name is later used to reference global variables in expressions (see Expressions). |
| Value | An expression (see Expressions) that evaluates to the value of the global variable. |