Specials on Particular Time Frames

I was wondering if there was a way to enter somewhere Special Rates, within a certain time frame? Almost like a Last Minute Special. For example, I wanted to reduce my rate by $150 for a weeks rental coming up in 3 weeks. Thus, if someone inquiries during that time frame, a separate line item would come up with a reduction of $150.

I am not sure I am explaining myself correctly. Right now, it would have two line items… rate, taxes. I would like to see another line item, if applies, stating the Discounted rate of $150 (as it comes up if it is a HOLIDAY rate added).

Can this be done?

Claudia