
1
Add Dataslot in Config Portal
Click on the
Config Portal in Salesforce and click on Add Field button.2
Provide details
Provide a name to the dataslot and select 
Type as List Contact List Values. Click on Add Field.
3
Save
Click on
Save Field and the dataslot is now added for your users to select a list in config.To use this dataslot in the Sync workflow, you would need to change the action in Node 2 to
Get Contacts Of A particular List and provide this dataslot in Enter List ID field.Navigate here to learn how you can manage Configs for your end users.