Updating a level member without running the collections ?

Hi All,

  We have a requirement to update the planner code for items. The planner code is a combination for both Item and organization. So we have it as a matrix level in demantra. We have customized our collections process to update this level when the collections run. We have a requirement from client that they will be updating the planner code in future. This will not be a problem when we run the collections in complete refresh mode every time. We are planning to run weekly collections with refresh mode as net change. How can we update the levels for