Load your plist into a NSDictionary and access the elements.
Code:
NSDictionary *plistDict = [[NSDictionary alloc] initWithContentsOfFile: @"list.plist"];
NSDictionary *subDict = [plistDict objectForKey: @"xxxKEYxxx"];
NSString *xxxString = [subDict objectForKey @"xxxSUBKEYxxx"];
[plistDict release];