Thanks for posting in the Community, @angellucero.
Yes, you'll have the option to adjust your employees' vacation balances on the next payroll. Just go to the Run payroll screen from the Employees tab. Then, locate your four salaried employees and enter their adjusted balances from there. For the detailed steps, check out this article: Vacation Leave For Salaried Employees. Go to the QuickBooks Online Payroll (Self Service and Full Service) section under Add sick pay or vacation pay hours.
I recommend visiting this website: Time Off Overview. It provides you steps on how to set up your employees' time off, change their policies, and add more hours to them. Doing so will help you ensure their policies are up to date in the program.
We also have answers to the most commonly asked questions about salaried employees in Online Payroll. With this, you can find them through this article: Salaried Employees FAQs.
I'm here anytime you have other concerns. Enjoy the rest of your day, @angellucero.