Excel Macro

Hi, I need someone who has an advanced Excel VBA Macros knowledge. The project is the following: There is an Excel file which is the "Master file" and contains a menu with options (a form with check-boxes). The user, using the Master file, should be able to do the following: - display data from different files - concatenate data from different files and show them in one "summary" workbook - do various sums and statistics I can provide specific examples with what I would like to be done. Also, I have already started working on the menu (the user form) - this could be a good start. To understand better, this Master file will be used by a shop to keep track of sales. There is a large file which contains data about the goods that are bought by the shop and other files which contain data regarding sales. All options in the menu are related to these 2 main files. Please ask me any questions or details before bidding. This project is urgent and I really need your help.