Edition: Enterprise
User-level: Project Manager, Director, Assistant Administrator and System Administrator
Bulk assign all all hours for one role to a staff member in the project schedule.
Organisation menu > Projects
Open the project you want to bulk assign a role on
Project menu > Plan > Schedule
Click the arrowhead to view all resources under that stage
Click on the role under the stage
Click the toggle to 'Assign to all unassigned X roles to this project' and select the staff member from the dropdown
Select Assign