Hi, I need to develop an offline excel tool for currency conversion. As I very frequently use the conversion of currencies in my work.....one challenge is the converted values should never be lesser (in case of inaccuracy) but slightly higher will do. Also I need to update rates quarterly which are not as per internet, that is why I need to create this tool offline. So, please also help how can I update rates periodically by dragging or importing file. What format should I use for importing? Kindly help