Combobox + Array formulas

Hi

I have a combobox with various items like 2005, 2006, 2005 Q1,
2005Q2, Business.Combobox is called Combobox1 and in Sheet5

I have a common VB code .

ActiveSheet.Evaluate("SUM(IF($CU$7:$CU$4978=2006 ,IF($K$7:$K
$4978=""Accept-Create New Project"",$G$7:$G$4978,0),0))")

In the above code I have hardcoded it for 2006. But I need to change
the 2006 with what ever user selects in combobox.

Pls suggest