The Parameter Manager also allows the insertion of input parameters that can be used to drive other input variables or define useful constants within expressions.

To add an input variable to the Parameter Manager Grid, simply click the Add Variable () button in the toolbar. This action will add a new input variable, with the default value of “0” and the lowest possible “Pn” expression id, where n is the next consecutive integer in the existing list of “Pn” expression ids.

Feel free to change the expression id. An expression id can be any string that begins with an upper or lower case letter and does not contain any non-alphanumeric characters. The case of the expression id will be respected within the expressions, however, it is not recommended to give parameters expression ids with varying case. For instance, using ‘A’ and ‘a’ as expression ids at the same time can become very confusing.

Certain variable names that are used throughout Workbench are also restricted. The following expression ids cannot be used within the Parameter Manager: X, x, Y, y, Z, z, and time.

To delete a variable (or any parameter) simply select a cell in the row for the parameter that needs to be deleted and click the Delete () button in the toolbar. Be careful, as this operation will invalidate any expression that is currently using the variable that is deleted.