Sage HRMS (Version 10.4018) Adding More Employees

SUGGESTED

We have Sage HRMS (Version 10.4018) and have the 300 employee version.  We do not use Sage HRMS for payroll - we just use it for our personnel database and reporting.  We are getting ready to hire over 200 more employees.  Would love to just add more employee seats to present version.  How do we go about doing this?

Thanks!