In the Baseline app, adding issues to a specific baseline is an essential part of tracking progress and maintaining control over changes. The following guide outlines how users can add issues to one or more baselines directly from the issue view in Jira.
Steps to Link an Issue to a Baseline:

Once the issue is linked to an open baseline, it will appear in the Issue Table of the respective baseline's home page.
If the baseline is later committed or completed, the issue will no longer be unlinkable, and its state will be frozen, reflecting the status at the time of commitment. Additionally, for committed baselines, users can view a snapshot of the issue as it appeared when the baseline was locked.