You can't. There's quite a few supplier parameters that need to be configured in order for Expedia to work via iVectorOne (Expedia can tell you what these are in the first instance!)
As the account to supplier ratio is 1 to 1 within iVectorOne, you'll need 2 iVectorOne logins if you want both hotel only and package rates from Expedia.
The supplier setting that commonly controls this is Sales Environment, which can be hotel_package, or hotel_only.