No.  Your Travel Savings Access Code is the money you save when you or a user books a hotel/resort/car rental/more ⏤ see screenshot below for an example.
If you purchased $500 in Travel Savings you would only end up using $220 on the booking below.
Instead of paying $3,120, you would only pay $2,900 for this trip, and you would have $280 left for you to use towards another booking.