insert variable into formula?

Hi
Is it posable to insert a variable into a formula? I’ve been trying to with no success for weeks. Going in circles now.
Here is 1 of the scripts I could use a variable for.

repeat 1 times --serval hundred
	tell application "Microsoft Excel" --copies formulas
		activate
		activate object worksheet "Sheet1 (2)" of active workbook
		set dr1 to (get value of cell "g1") --values to add in sheet1
		set dr2 to (get value of cell "h1")
		set dr3 to (get value of cell "i1")
		set dr4 to (get value of cell "j1")
		set dr5 to (get value of cell "k1")
		delete range range "a1:k1" shift shift up
		activate object worksheet "Sheet1" of active workbook
		set formula of cell "AG3" to "=t3+u3+v3+aa3+ab3" --need variables here,these are dr1 to 5
		set sourceRange to range "AG3" of sheet "Sheet1"
		set destRange to range "AG4:AG500" of sheet "Sheet1"
		copy range sourceRange destination destRange --applies formula to range
		set formula of cell "AH2" to "=COUNTIF(AG3:AG500,0)"
		set formula of cell "AI2" to "=COUNTIF(AG3:AG500,1)"
		set formula of cell "AJ2" to "=COUNTIF(AG3:AG500,2)"
		set formula of cell "AK2" to "=COUNTIF(AG3:AG500,3)"
		set formula of cell "AL2" to "=COUNTIF(AG3:AG500,4)"
		set formula of cell "AM2" to "=COUNTIF(AG3:AG500,5)"
		set formula of cell "AN2" to "=COUNTIF(AG3:AG500,6)"
		copy range range "AG2:AN2" of worksheet "Sheet1" of active workbook
		
		activate object worksheet "Sheet2" of active workbook
		
		set TargetRange to column 1 of the active sheet
		set AfterCell to cell "A1" in the active sheet
		set FoundRange to find TargetRange what "" after AfterCell look in values look at whole search direction search next
		select FoundRange
		set pasteRange to (get address of FoundRange)
		paste special (range pasteRange) what paste values--transfer data to
		
	end tell
end repeat

Any ideas?
Thanks
bills