The Shift Builder feature allows you to create multiple shifts for the same event all at one time.
Once you create an event, click on the shift builder button in the event toolbar.
In this view you can create multiple shifts by choosing the position, quantity, start time, and end time.
Choose as many shifts as you want to create and when you're done click update event button to save them in the event. You also have the option to update the event and update and notify. Clicking "update the event" will save the newly created shifts and any changes made to the event, while clicking "update and notify" will do the same and notify confirmed workers of any edits made to their shift.
Once you have clicked update event or update and notify, the shifts will be populated in the event and you can go ahead and begin assigning or requesting workers to those shifts.