You didn't say where you want the data returned. For the purposes of the
example, let's suppose the item number of interest is in SheetB cell A2, and
you want the data from SheetA returned to cell B2. Then in B2:
=vlookup(A2,'Sheet A'!$A$1:$E$4000,5,false) (replace the 4000 with the final
row of your data in sheet A, or just use $A:$E to search the entire column).
--Bruce