I think I solved this...
Not technically possible to create a 'non-generic' group that accounts for resource usage for those assigned to the group, and that I can just assign to tasks.
Instead, can use the group field in the resource sheet to label resources as belonging to a certain group; then use the filter in 'Assign Resources' and filter by group to get all members that are on the committee...
Found the answer here:
http://social.technet.microsoft.com/...8-653e19884212
jjmclell