Need help with a formula for a customer worksheet to track spending

I have a worksheet to track customers purchases
the layout looks like this:

***** A ******* B ******** C ******* D ******* E
1 * Total ************************* Prod1 ** Prod2
2 * Spent ** Name * Account * $30.00 * $20.00
3 *********** Cust1 *** 12345 ****** 0 ******* 4
4 *********** Cust2 **** 7678 ****** 1 ******* 8
5 *********** Cust3 **** 2345 ****** 0 ******* 1
6 *********** Cust4 **** 22489 ***** 3 ****** 12


Basically I need to simplify this formula to allow for a Large amount of products
as well as add new products in the future.

A3 formula =(D2*D3)+(E2*E3)+(F2*F3)+(G2*G3)

I would then like to copy the formula down column A for all customers..
Any ideas? or do I have my worksheet layed out completely wrong?

Welcome,

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