I'm trying to write a logical function with 4 nested IF functions in a cell.
The Excel help menu and a manual I referenced used examples with exact
numbers rather than a series of numbers - which is what I need. Please see
examples below.

IF(H7<5,(F7),IF(H7=5,(F7*0.9)))
this formula is operational but incomplete for my needs. In the second IF
function, I need not only a "5" but a series of numbers: "5 up to 9" or "5
but less than 10"

Beyond that, I need to add 2 more IF functions after the second, for a total
of 4 IF functions in the cell.
IF(H7<5,(F7),IF(H7=5 and <10,(F7*0.9),IF(H7=10 and
<25,(F7*.85),IF(H7=25,(F7*.80)))))