Hello,

You can set the Business owner and Technical owner through the K2 API. There is a property for Business owner and Technical Owner.

Please see the developer documentation below for these two properties:

Business Owner: http://help.k2.com/onlinehelp/K2blackpearl/DevRef/current/default.htm#../Subsystems/Default/Content/topic6773.html

Technical Owner: http://help.k2.com/onlinehelp/K2blackpearl/DevRef/current/default.htm#../Subsystems/Default/Content/topic6783.html

Otherwise, you could create the groups Business Owner and Technical Owner then manipulate the group process rights in K2 Workspace depending on what you desire. 

See here: http://help.k2.com/onlinehelp/K2blackpearl/UserGuide/current/webframe.html#Reference-WS_MCon-Workflow-Users_ProcessRights.html

Evan