Installation
Get it on Atlassian market version
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Navigate to Custom Fields https://<YOUR_INSTANCE>.atlassian.net/secure/admin/ViewCustomFields.jspa
Click Create Custom
Select All
Search for Delegated and select the type
Status colour Blue title Delegetated Field Give it a name and finish the creation of the field. The field is smart and can be rendered as different types, this is done from the Project Settings page and can be done by project admins.
Step 2. Configure the field
Go to the project where the field will be used
Add it to the screen (if not all ready added)
Click Project Settings (cog)
Expand Apps and click Delegated Fields
Click Configure Rendering
Select how the field shall render as
Enter values as a comma separated list
click submit
Done!
Use the fields as a normal field on the issue.