Scheduling in Simevents

I want to Schedule a process where I've some 5 different enttites being generated and each going through a process. Like A entity goes to 1 step, B goes to 1 and then 3 step, C goes to 1 and 4 D goes to 2 and E goes to 2 and 5 1,3 and 4 process steps all have same 6 resources working on it. and 2 and 5 have same 5 resources working on it. can anyone help me out on this? coz an N server block would have fixed no. of servers and not varying. Also i'd want like if B entity has cleared step 1, then it goes to clear step 3 right after it instead if waiting for all the B entities to clear step 1.