If you have part-time staff that normally get paid less than $350 dollars a week, then all you pay each week is their normal pay at 100%.
For example, John works part-time and earns only $200 per week. You have received $350 in subsidy for him but in this case, you would pay John $200 and carry over the $150 to the next week.
You must, over the course of the Subsidy ensure that everything you receive is paid to the employees. Also, would be very important to keep a Subsidy Spreadsheet so you can clearly track the subsidy receipts and your gross payments to staff.