Macro To Extract Data From Multiple Worksheets

I have a spreadsheet containing a factory's operational data, with each machine in the factory being represented by its own worksheet.

The sheets all have the same structure, with each line of data representing a shift (we have 12-hour continental shifts, so column A of all the pages has the date in an standard format, and column B has either "d" or "n", representing the shift). Various datat is documented on each machine on a shift-per-shift basis.

What I need to do is figure out how to do a macro that extracts all of the lines on all of the machines' worksheets that pertain to a particular shift (for instance, all of the lines where column A read "14-Mar" and column B read "d"), and export the values of the entire row to another worksheet, creating a shift summary on one page.

To do this, I would like to make the date and shift user-definable variables that appear at the top of what would become the summary sheet, and have a button that activated such a macro at the top of the page as well.