Extract From A List If A Cell Has Data In It

This will get kind of complicated just a heads up.. I will try to take it in phases.... Without actually uploading my true sheet I will do my best to give a representation of what I'm trying to accomplish. Basically I will have Lists for the Year by Month. In each month the list will compile a list of problems and there corresponding data for each problem. Most of the problems will be internal, however some will be due to external (a supplier). When this occurs the suppliers name will be input into one of the columns. I want to beable to pull out the suppliers from each month and then sort them in order from top offenders to minor offenders by "QTY"

See the attached example sheet. That should give a better understanding of what I need to do.. I am not sure if this can be done with worksheet functions so I posted it under the Programming thread.