Hi @Evert
There is only one Time dimension in eazyBI, and it is not supported to import date picker fields as new alternative Time dimensions (See documentation: Time dimension).
Instead, import the date picker custom field as a measure in the Jira import options. This will automatically create a measure called “Issues with ” that counts issues whose dates fall within the selected Time period. You can then use this measure together with the Time dimension to filter and group data by your custom date field.
This community post explains the setup with screenshots: https://community.eazybi.com/t/connecting-time-measure-to-time-dimension/12756/2
Best,
Zane / support@eazyBI.com