Creating weekly calendar template that has overlapping positions

Hi, 

I have a software for individuals to sign up for shifts, but it is visually hard to see where there are open areas that need to be filled. I need help creating a calendar from this software download that I can update each week. It would have to be much like an hourly scheduler view to easily see when someone is coming on and off shift. But also laid out from Sun-Saturday. There is 3-4 "slots" for each day. It would be great if they could be color coded as well. Slot 1 needs to be anyone that is "AEMT" in the position column, Slot 2 can be anyone listed as "EMT" or "EMR" (caveat to this would be that slot 2 could also be AEMT if there is already an AEMT in slot 1 for the same time slot. Slot 3 is for driver or ride along (or the other 3 positions if there is one listed in the other slots), and possibly 4th slot would just be overflow in case there were 4 people signed up which does not happen very often. Is there anyone who can help me with designing this? Below is what the software generates when converting to excel