Creo Simulate > Reference Links > Interpolated Over Entity
  
Interpolated Over Entity
Use this option to vary a load linearly, quadratically, or cubically along the entity you selected. You can use this option only if you selected a single entity—edge, curve, or surface—for this load.
When you select Interpolated Over Entity, the Define button appears on the dialog box. When you click this button, a Load Interpolation dialog box appears, which enables you to:
add a new interpolation point
remove interpolation points
preview an interpolation
The interpolation you create is associated with the load and the entity.
Return to Spatial Variation.