Editing lib/edit files

[moonsdad]

I want to make a new spell book that contains already existing spells -- just renamed, for a new class that I plan to make.

the addition to objext.txt will be:
N:##:[Runelore]
G:?:r
I:90:4:0
W:30:0:900
A:30/1
P:0:1d1:0:0:0
F: EASY_KNOW | IGNORE_ELEC | IGNORE_COLD

in x-spell.c I see that the spell numbers are hard coded, so to edit spell.txt can I add second I:tval:sval:snum line to the spells I want included in my newbook, or should I make duplicate enteries with the same N:serial:spellname line, or do I have to muck around with the code?