...

Step 2. Configure the field

1. Go to the project where the field will be used

2. Add it to the screen (if not all ready added)

3. Click Project Settings (cog)

4. Expand Apps and click Delegated Fields
   

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5. Click Configure Rendering

6. Select how the field shall render as
   

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7. Enter values as a comma separated list
   

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8. click submit

Done!

Use the fields as a normal field on the issue.