If you download and install the Cisco Productivity Tool on you computer, in your Outlook menu appears a new Webex panel part with "Meet Now" and "Schedule Meeting" icons. Based on the found related documents there is an option panel for Telepresence endpoints to schedule on the right side and on the menu as well. Sources:
1) Productivity Tools: Integrate WebEx into Outlook (WBS29.13, WBS30)
What you're referring to is CMR Hyrbid, do you have that setup and configured?
It uses your on-premise conferencing resources and connects to WebEx Meeting Center, you'll need to work with a Cisco partner to setup and configure your on-premise infrastructure as well as work with WebEx to enable the feature on their end.
You setup an Exchange mailbox for each endpoint in TMS, and you simply add the endpoint's email address to WebEx Meeting Center invites, and TMSXE will scheduled the endpoint to dial into the WebEx MC meeting. See the TMSXE Deployment Guides for more information, it also goes over the booking process.