Fields (Default values)
On the Fields - (Default values) tab, you can assign values to be applied to certain fields on synced work items . When you configure a default field value for a project, it will be applied to all new work items created by the synchronization in that instance.
This feature is especially useful when:
There are required fields on the target instance that must be filled for work item creation.
You want to ensure that a consistent default is applied to all synchronized work items created by Backbone.

Add a Default Value
You can add a default value by following these steps:
Go to the Fields - Default Values tab
Click on Edit Configuration
Click either on the + or “Add Default Value“ button in the project you want to add a default value for
Select the field you want to apply a default value for
Select for which work types the value should apply for (by default: all)
Set the default value
Save your changes
Publish the configuration
Supported Default Value Fields
You can apply default values to the following field types:
Single-line text, e.g. summary
Multi-line text, e.g. description
Multi-select version, e.g. Affects Version/s
Multi-select components, e.g. Components
Priority
Labels
Select list (cascading) fields
Custom Multi-select fields
Custom Single-select fields
Customer Request Type (only available in Jira Service Management)
Epic link
Group picker