removing unwanted data

Discussion created by fifi01011900 on Jul 2, 2011
Latest reply on Jul 6, 2011 by fifi01011900
I have data for various parts of the country e.g. contours, rivers etc which were supplied to me all as one set of files but I only need to use one area of the country for a particular piece of research, and this means the file is massive - very slow to load and to update.  I know that by opening the table I can see various bits of data, but it is not obvious which bit is from where in the country.  Is there a way that I can select the area I want on the screen and remove all data from outside this e.g. in layman's terms a "crop" feature?  I am using version 9.2
thank you