I have used two options when deleting records from the CMDB.
1) The best option would be to create a new reconciliation job with the Delete activity under the BMC Atrium Core Console. However, you MUST setup a qualification to specify only deleting records in the AST:HardwareSystemComponent form (either all or those with special criteria). If you do not include a Qualification Set, the CMDB will decide to delete all CIs and relationships in that particular dataset.
2) You can also load the form AST:HardwareSystemComponent through the old Remedy User client, search for the records to be removed, and then use the Delete option under the Actions drop-down menu. Considering the Remedy User desktop client is no longer supported, I would only use this as a last resort.
Thanks James, on advise for Asset.