I know that there'sa lot of members here who are just starting to learn Pro/E. Here is a model sample of how to create an extension spring using a combination of curve from equation, two projection curve and variable section sweep with relation. I just made it like a cable spring to be more interesting.
View attachment 757
2005-03-25_064855_expansion_cable_spring.prt.zip
View attachment 757
2005-03-25_064855_expansion_cable_spring.prt.zip