Cell views & plot in cadence

Hi,

1. What are the difference between schematic and schematic_sim in cadence ?

For example, I have schematic_A which has a symbol_B. Symbol_B further has some schematic with a symbol_C of a verilog-A code and schematic_A is again made as a symbol_A.

The hierarchy is something like this: Symbol_A-->Symbol_B-->Symbol_C

When I desend symbol_A in my main schematic to look what is inside, Cadence gives me option to open in the following:-

a. Schematic

b. Schematic_sim

c. Layout_int

d. Extracted

e. Schematic_lvs &

f.  Symbol

When I desend & open the schematic_A by schematic the Symbol_B doesnot appear. But when I open it with schematic_sim the Symbol_B appears. I want to know the reason of it or an explanation of where to use Schematic and Schematic_sim.

2. Similarly, where to use spectre, spectreS and symbol of the models in the FDK and their compatibility.  For the fact I noticed that, as we go down the technology spectreS is missing. For example in UMC 130 nm and 28nm technologies the spectreS view of the module is unavailable, whereas in AMS 0.35um we have it. Is it something like spectreS is an old cell view format ?

3. Is it possible in Cadence to plot two different plots from different technology ?

Thanks in advance.