On the Jobs page, choose a job where you want to a booking. Once the job card is opened, tap the "+" icon on the lower right corner of the screen and select "booking" from the options.
Start adding booking details. A booking name is required as well as the job start and end date and time. Assign the job to one or multiple staff by hitting 'Add staff' and choosing the name(s) of the staff you want to allocate the job to.
Press the '✓' on the uppermost right corner of the screen to save the booking.