Not too certain what you are asking. If you need to calculate sequential numbers, simple python code in field calculator (from Arc Help):
Calculate a sequential ID or number based on an interval.
Parser:
Python
Expression:
autoIncrement()
Code Block:
rec=0
def autoIncrement():
global rec
pStart = 1 #adjust start value, if req'd
pInterval = 1 #adjust interval value, if req'd
if (rec == 0):
rec = pStart
else:
rec = rec + pInterval
return rec
And if you have a definition query, it will only calculate values for the selected records.
Regards,
Jim