Are you using the Table Grid Next Generation? Check the documentation here.
Are you using the Table Grid Editor for Jira Cloud? Check TGCD.
The Table Grid Editor is a JIRA custom field plugin allowing you to view and edit database data in a tabular fashion.
It allows you to store detailed information in an external database while keeping process related information within JIRA.
You can use the grid in JIRA for
More features here
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