A more powerful way of creating macros is to write your own. The principles are described in the Macro User Guide.
Macros enable you to:
- Construct expressions.
- Use expressions to control macro flow.
- Use a range of relational operators and logical operators.
- Evaluate both expressions.
- Assign values to variables and parameters by using assignments.
Click Help 
> Documentation > Parameters >Reference > Functions to list all the standard functions you can use in macros.
Note: For information about using parameter functions in setup sheets, see Using parameters in Setup Sheets.
For more information see the Programming Language Guide.