►What is the constant function?

The constant function used to provide a way to define a very simple price. Always returns to the fixed price.  In order to create a pricing plan with "Constant", select control: (1)

a. add the desired name for the control.   
b. specify minimum and maximum value. 

Note! When you set the number for the maximum value you can not choose a number more than that.

By selecting "Price" you can switch to price configuration.  

c.  In Price is vendor price. Retail Price is a suggested retail price.
You can switch to preview mode by selecting "Preview".

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In Price and Retail Prices will remind constant despite the selected amount (up to maximum value).