odrive treats the linked storage separately, so it is possible to have the same large file synced locally in both the "odrive\Google Drive" folder and "odrive\Amazon Drive" folder.
You can use odrive unsync to turn one or both of those files (and any other synced files you choose) into placeholders using the right-click->unsync option. You can read more about this here: https://docs.odrive.com/docs/manage-disk-space#section-unsync-old-files
If you are asking how to sync a file from Google Drive to Amazon Drive, you can't do it directly. You would need to download the file from "odrive\Google Drive" and then copy it into odrive\Amazon Drive. After copying, you can right-click->unsync the file in "odrive\Google Drive" to free up that space.