You have multiple options. Many customers simply upload a spreadsheet. You can do this using data loader (search Remedyforce help for "import" or "CMDB" for more details. Others use our standard integration connectors for MS SCCM or BMC Atrium Discovery and Dependency Mapping (separately licensed products). Both options are documented in help and the actual integration connectors are available here in the BMC Community. Finally, some customers simply create CIs manually, although for a large number of CIs, the first two options are definitely more efficient.
Hope this helps get you started.
Thats great, thanks for the pointers. Do you know if there are any 'discovery' features on the roadmap for remedyforce? I know there are challenges with this as it lives on force.com, but are there any plans for a broker type service that we could deploy in our network to discover and track CI's? No worries if not, I will continue investigating the options you have mentioned.