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Would like to know more? Check the documentation.
If you are having questions on what to / parent, from / children mean, read this page: https://confluence.intranet.requirementyogi.com/wiki/spaces/RYC/pages/2564128774/Requirement+dependencies#I-cannot-remember-what-TO-and-FROM-is-%3F-What-is-the-direction-of-dependencies%3F