Hello Gail,
Unfortunately no, there is not a way to force it to be grayscale via FusionPro Desktop/Designer, or a setting in MarcomCentral.
Jeff Stehman
Technical Support | PTI Marketing Technologies | Printable Technologies, Inc.
jstehman@pti.com | www.pti.com
858.847.6622 direct | 800.220.1727 office