A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Select C5:C49 on the ASSY_MASTER_LIST sheet.
C5 should be the active cell in the selection.
On the Home tab of the ribbon, click Conditional Formatting > New Rule...
Select 'Use a formula to determine which cells to format'.
Enter the formula
=ISNUMBER(MATCH(C5, 'BASE MODEL'!$D:$G, 0))
where D:G is a range containing the part numbers.
Click Format...
Activate the Fill tab.
Select green as highlight color.
Click OK, then click OK again.