rules that should be applied on a lime item basis should be created on the Calculations tab.
to create a 34% discount on 2 or more, modify the TotalPrice calculation to;
(([Quantity] >= '2')?([Price]-([Price]*0.34)):[Price]) * [Quantity]
this basically says:
if the quantity is 2 or more, the price of each item is [Price] - ([Price] * 0.34) else the price of each item is [Price]