To the best of my knowledge, it is not pssible to import the ACS logs to VMS.
This document contains frequently asked questions (FAQs) about VPN / Security Management Solution (VMS), which includes these components:
CiscoWorks Management Center for VPN Routers (Router MC)
CiscoWorks Auto Update Server (AUS)
CiscoWorks Management Center for Firewalls (Firewall MC). [This component was known as Management Center for PIX Firewalls in earlier versions.]
CiscoWorks Management Center for IDS Sensors (IDS MC)
CiscoWorks Monitoring Center for Security (Security Monitor)
CiscoWorks Management Center for Cisco Security Agents (CSA MC)
CiscoWorks Monitoring Center for Performance (Performance Monitor)
http://www.cisco.com/en/US/products/sw/cscowork/ps2330/products_qanda_item09186a00802c2a10.shtml
