Thank you. Here is the official process for test-center based score report sending: You have to do it at the test center.
We will send your Official Score Report to up to five (5) programs that you select at the test center prior to the start of your GMAT™ examhttps://www.mba.com/exams/gmat/after-th ... to-schools You can definitely send the additional score reports at a later time but once you start the test, you can't add more programs/send additional score reports and you will have to pay a fee.
Here is the GMAT online score report process:
Your 5 free score reports must be used within 48 hours of receiving your official scoreThis means you have until you get the official score confirmation with AWA which may be a few weeks after taking the test.
https://www.mba.com/exams/gmat-online/g ... mat-online