Combining multiple excel sheets into one excel file and updating it each time there are changes.

i have 5 excel workbooks with all the sheets named the same. what I want to do is combine the 5 excel files into one workbook with the sheets in each of the excel file file merged together with the same sheet name respectively. for example in excel file 1 there are sheet names sales and items and in excel file 2 there is also sheet names sales and items. what I want to do is combine the two excel files with each other so that excel file 1 sales and excel file 2 sales are merged together and excel file 1 and excel file 2 items are merged together. Is there a way for this? And I want the excel file to be updated on a regular basis maybe weekly once or twice if there are any changes into the 5 excel files