You can't import attendance into a timesheet since employees either clock in/out or the fill in a timesheet - never both at the same time. You can define in the employee's "Time Capture Method" (as highlighted in the figure above) whether that employee will:

• Record total hours worked in their timesheet - meaning that attendance clock in/out time-pairs are not expected
• Record exceptions (overtime/absence) in their timesheet - meaning that timesheet entries are automatically created for the employee's normal work-schedule by time evaluation - there is no need to record normal hours worked
• Clock in and out (attendance data capture)