Pay early, Pay less

Hi there,

I have two questions:

1) is it possible to provide "early booking" prices?
Like:
a) Book a room 4+ Weeks before arrival, get 25% discount.
b) Book a room 2 Weeks before arrival, get 15% discount.
c) Book a room same day or 12 days before get 0% discount, pay standard price

2) In case of (a) and (b) Is it possible to "block" the amount of money on credit card?

thank you!