I figured it out. I added to the custom tier pricing.
Thanks,
Kenyatta

Hi,

I attached the xml code but when I add 3 or more items to the cart it still takes off the Tier pricing $20. When the coupon code is used I don't want the system to add the tier pricing. 

Please advise,

Kenyatta

The only way is to add back the equivalent adjusted amount in your discounted value based on the quantity sold. For example, if the tier discount subtracted $20 for 3 quantities, you want to add back +20 in your new discount rule when the quantity of 3 is detected using an xsl:if or xsl:choose condition.

This may be too complicated. Can the coupon promotion not be simplified such that the coupon gives a smaller % discount to begin with and that way you don't have to mess with the tier pricing?

Doesn't the logic in the code say if coupon found then don't apply tier pricing? I think that's the easiest way to go. However i'm not sure why it's not working.