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Select the Control Points of the right side of the embosses (yellow ones) and confirm. In the Axis Definition window define the translation vector (negative X-axis). Middle click twice to confirm and exit the function.

The distance between the embosses will be defined as a parameter. In this case a new parameter with type TRANSFORM is used. The selected Control Points will be moved along a specified vector.

Select all the Control Points of the one emboss (white ones) and middle click to confirm. In the Axis Definition window that appears define the vector of the translation. In this case the X-axis. Middle click to confirm and another group of Control Points can be selected (yellow ones) and another translation vector (negative X-axis). Middle click twice to exit the function. The name of the parameter is Emboss_distance.
 

All the parameters are defined and can be visualized, edited or modified through the Parameters list: CONTROLS>PARAMS.