Am looking for a multiple named-range solution that contains formulas in each
cell.

This is the range stored in a table on another worksheet [let's call it WSR]
that would be named TaxCalc1 ...
=-$H7*Tax1PHd =+Tax2Other =-($J7+$L7)*Tax3Mult
What should happen is when my lookup becomes "TaxCalc" & "1", the above
formulas drop from WSR into cells L7:N26 on the relevant worksheet [let's
call it WSC].

Accordingly, when my lookup becomes "TaxCalc" & "2", another set of cells
that are in the same source table on WSR, named of course TaxCalc2, which
have slightly different formulas, then drop into L7:N26 on WSC.

And so on with TaxCalc3, TaxCalc4, etc as required.
There will be at least half a dozen.

Keeping in mind that a named array range can contain constants....
1stQtr = Array("Jan", "Feb", "Mar")
2ndQtr = Array("Apr", "May", "Jun")

.... Am hoping that someone knows how to substitute the constants in the
above Qtr example for formulas.

I have tried and tried various methods/syntaxes to no avail, and am now
stumped enough to type all of this [!!].

Thanx in advance to anyone who can assist.
Regards,
- Mike