DAX Append Query - Merging Data

Hi,

I have an Excel workbook with reference data - i.e. Days of the Year, Week#, Month# etc...

Other tabs bear data for certain processes, i.e. Sales etc.. which are date related.

I want to use a date slicer and roll up data so that when I look at Feb as a month, it gives me the total of all Sales and other departments etc...  The common theme is the date but I need to create Dax queries to compute things like revenue / expenses etc... which I can manage.

Please help.

Thanks,

S