There's not a facility in the Fusion GUI to do reserve DHCP addresses for specific VMs.

I've done this in the past, but it involved manually editing the dhcpd.conf for the NAT networking segment found in /Library/Preferences/VMware Fusion/vmnet8 (for the default NAT network, other vmnet directories are for either the default host-only or custom host-only networks). If I remember correctly, the VMware dhcpd is based on an older version of ISC dhcpd so using its settings to recognize hosts on a particular MAC address should work.

Note that if the user reconfigures the networking, the dhcpd.conf files get overwritten, and the changes will need to be manually applied again..