pejotade

Scenario: recieved nonB on an agency. Work permit still has to be issued. However it seems agency cant supply further employment. A school have said that they can employ me. So how do I go about with NonB.. ? Can it be changed from the agency name for emoyment to a school? When the WP not issued yet.. no extention of stay.. jjst started 90 day period. Can the school that want to employ then apply for WP with NonB visa connected to agency?