Transferring of an employee from one company to another can be done by using the Copy and Paste feature in the Employees screen.
Go to HR > Main > Employees.
Click on the employee that you would like to move, and click Copy.
From the Company selection drop down list, select the other company.
When asked to open the other company in a new tab, click No.
Click Paste to paste the copied employee to the new company. You will be asked to enter a new Employee Code accordingly.
The employee will still exist in the other company. You can delete the employee from the other company provided that they have no payroll history.