In Creo Parametric, you can replace an entity and redefine a section after several features are created. The children of the replaced entity are automatically rerouted to the new entity. To replace one of the sketcher entities in the part, use the below steps
Step 1: In Sketcher, sketch the desired entity (spline)
Step 2: Select the entity to replace and in the mini toolbar, click 
Replace
Step 3: Select the newly sketched spline.
Note: The system may indicate that it cannot replace an aligned or dimensioned entity and if the dimensions should be deleted. Click Yes.
Step 4: Regenerate the sketch. The relevant extrude updates
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