There could be scenarios where companies pay the advances to the employee and write off with the expenses paid to them. In NetSuite, advance to the employee is paid using Write Cheque functionality.
In new cheque page select the payee and account as advances paid (default NetSuite account of type other current asset) and save the cheque.
Advance Cheque to an employee for the amount 100
When this employee is selected in the expense report, NetSuite automatically shows the advance paid to the employee in Advance to apply field.
Expense report showing Advance to apply as 100 for the same employee