HP-48G local variables within subroutine

[grbrum]

Hello. Can someone help with the syntax of using local variable being used in subsequent formulas?
Example
<< -> a b ‘a/b’ ‘ b*b’ >>

In this example I want to load the stack with a and b and the output to be a/b and a*b
the manual makes reference to using a left arrow key( alpha+right shift+left arrow)
But I don’t find an example of the syntax.

Thanks