I have 2 spreadsheets with data from 2 systems.

What I need is to take specific data from sheet 1 and match it to the
corresponding line in sheet 2. The problem comes in that each sheet only has
a unique entry if I search based on a combination of 4 columns (item #, date,
location and quantity).

For any one of these search items there will multiple entries, but for the
combination of all 4 there should be one unique entry.

How can I accomplish this to compare the two spreadsheets?