p49 :
To define parameter hierarchy overrides and defaults, use the .OPTION
PARHIER=global | local statement
p291:Figure 26 on page 291 shows a flat representation of a hierarchical circuit,
which contains three resistors.
Each of the three resistors obtains its simulation time resistance from the Val
parameter. The netlist defines the Val parameter in four places, with three
different values.
这本书有一个简单的例子说明其使用,但是没说明两者仿真的区别