►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 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 constantly despite the selected amount (up to maximum value).