Classic Availability Requests subtab (Task)
In this tab, you can simultaneously send job offers for all jobs included in the task, select the strategy to determine which vendors will be assigned to the job, or manually assign the vendors.
To find out more about availability requests, see the Assign vendors via availability requests | I. Create and send availability requests guide.
You can specify whether the vendors should receive requests for each job in one message or in separate messages in the 
Configuration menu > Projects and Quotes > Settings > Availability Requests (Classic) tab.
To find out more about workflow-related default settings of availability requests, see the Configure a task workflow definition – Time and Requests guide and Project and Quotes – Settings – Notifications and Alerts tab article.