Create a new calculated column on Sheet1 titled key and for row 2 make it:
=$a2&"."&$b2&"."&d2
copy that down for all rows (hopefully your using Excel Tables so this happens automatically!)
On Sheet 2, for ViewName column enter in row 2:
=INDEX(sheet1!$D:$D,MATCH($a2&"."&$b2&"."&d2,sheet1!$D:$D,0))
copy that down for all rows (again, hopefully your using Excel Tables so this happens automatically!)
if you're using Tables you can modify this to reference the data items easily by editing the formula, and selecting the ranges