Introduction
You can create one or more constants. You can use the constants in the formulas.
Procedure
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Click [Price and formula editor] - [Constants]. 
 
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Click [Add]. 
 
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 Define a name. The name must be unique. 
 
  
You can use the characters: 'a - z', 'A - Z', '0 - 9', '_' . Spaces are allowed. 
 
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Define a value for the constant. You can type a value in the text field. Or you can click the arrow buttons to increase or decrease the value. 
 
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Click [Save]. 
 
  
The constant is added to the list of variables for the formulas. You can use the constant in the formulas.