Hi, I am working on a c-hook to do some edge curve creation on solids and chain them with operations so I managed so far to import an operation and add a single chains to it but I am not sure if I need to call append_chain after add_curve_to_chain, I would really apprectiate it if anyone could help me. I will include an example of the function I used to add single chains. void ChainAll(ent &entity12, CHAIN &pChain, CHAIN_ENT * &ce, chain_manager_info &cmi, int &int1, int