You searched for: “substituting
substitute (verb), substitutes; substituted; substituting
1. To exchange one thing for another equivalent thing: For the salad dressing, a normal onion can be substituted for a spring onion.
2. To fill in, as to cover for someone: Mrs. Smith had to substitute for Mr. Thompson because he was sick that day.
3. To replace: Some of the old parts of the machine were rusty and had to be substituted with new ones.