ReClassify Vector Data Between Values using ArcGIS Desktop?

I would like to be able to take all values between 1 and 10 and have a field define them as 1, and all values between 10 and 20 and set them to 2, how do I do that with vector data?

I read how to set all building to 20, and grass to 40, but I'm pretty sure that to do that for a range of values, like 1-10, I would have to manually enter each number, and decimal in that range. Am I wrong? and if not, how would I accomplish this?

Answer

This is a Job for the Field Calculator.

See this Python example at Calculate Field examples

Parser:
Python

Expression:
Reclass(!WELL_YIELD!)

Code Block:
def Reclass(WellYield):

  if (WellYield >= 0 and WellYield <= 10):
    return 1
  elif (WellYield > 10 and WellYield <= 20):
    return 2
  elif (WellYield > 20 and WellYield <= 30):
    return 3
  elif (WellYield > 30):
    return 4