Hi Ken
Yes, that certainly can be done.  For example, on one of the SummitStacks I admin, this config has been in place for a couple of years:
# show ports redundant     Primary: *1:13,  Redundant: 2:13,  Link on/off option: OFF  Primary: *2:14,  Redundant: 1:14,  Link on/off option: OFF  Primary: *3:22,  Redundant: *1:22,  Link on/off option: ON   Flags: (*)Active, (!) Disabled, (g) Load Share Group  This was achieved by entering the following config:
configure port 1:13 redundant 2:13 link off
configure port 2:14 redundant 1:14 link off
configure port 3:22 redundant 1:22 link onI hope that helps.
Regards
Warwick