To set Discounts on Quantities for the Product and the Attributes ...

Make a Product and set the Product Price to $100.00 and all the other settings ...

Go to the Product Price Manager ...

Hit Edit ...

Where you see the:
Add 5 Blank Qty Discounts:
Add 5 Blank Discount Qty
All 0 Quantity Discounts will be removed when Updated
Hit the button for:
Add 5 Blank Discount Qty
You will now see 5 blank discounts ...
Select the Discount Type: Percentage
Select the Discount From: Special

Enter the Minimum Qty and Discount Value:
2 50

Hit Update ...

Go to the Attributes Controller ...

Say you wanted to add Color Red and make it $100 for qty 1 and $50.00 for qty 2 and above ...

In the Attributes Qty Price Discount enter:
1:100.00,2:50.00


The results would be on adding to the cart:
Qty 1 Half off with Discounts $150.00 $150.00

Qty 2 Half off with Discounts $100.00 $200.00

Qty 3 Half off with Discounts $100.00 $300.00