Hello @dianne rinaldi,

Yes, your employees can clock in and out even without selecting a customer for their time activity.

In the same manner, here's an article you can read to learn more about your employee's time activity: Track and manage QuickBooks Time.

On top of that, I've also included this reference for a compilation of articles you can use while working with us: Help Articles for QuickBooks Online Payroll.

If you have any other questions, please let me know in the comments below. I'll be here to lend a hand.