admin buttons cart cart-discounts configured days discounts edit expire individually january number presently price product products sale temporary

Is there any way to set a temporary sale price on all products with e-junkie?
We want to have a 20% off sale in January. I suppose I could just go into each product individually and edit them,
but it would be nice to be able to set a sale price for the whole product line that would expire in N number of days.
Is there any way to do that with e-junkie as it is presently configured?

If you are using E-junkie CART buttons, you can simply set a 20% discounts in Admin > Cart discounts.