why we need traceability code example

Example 1: how to achieve traceability

in order to have traceability:
Release linking: epics with user stories,
stories with test plans; test plans
with tests, test with test executions

Example 2: what to do for traceability

in order to have traceability:
Release linking: epics with user stories,
stories with test plans; test plans with 
tests, test with test executions