To pause an employee's salary -
Go to Run Payroll, and select the payroll month.
If the payroll is already finalized, then click on "make changes".
Search for the employee for whom the salary needs to be withheld.
Click on the "edit" button, and then click on "do not pay".
To pay the same employee's salary later, follow the same steps as above, but after clicking on the "edit" button, click on "resume pay", and then finalize the payroll again.