Да:
NSString *rootPath = [[NSBundle mainBundle] bundlePath];
NSString *pListPath = [rootPath stringByAppendingPathComponent:@"Settings.bundle/Root.plist"];
NSDictionary *pList = [NSDictionary dictionaryWithContentsOfFile:pListPath];
Запись в файл тоже не сложна:
NSDictionary *dict;
NSData *data = [NSPropertyListSerialization dataWithPropertyList:dict format:NSPropertyListXMLFormat_v1_0 options:0 error:&error];
[data writeToFile:self.saveToPath atomically:YES];