Stock by attributes for several products at one time

I develop the site for hotel booking. I have a categories (hotels) and products (offers, such as 4 nights or 7 nights). For each category I need to enter the number of available rooms (date & quantity) and for each product - the prices of the room (date & price). How is this best done?

And how to implement the accounting rooms (stock)? For example, if a customer booked two rooms from a 3.03 to 7.03 in "offer 4 nights", then the number of available rooms must be reduced for both "offer 4 nights" and "offer 7 nights".
This is similar to "Stock by Attributes" module - there is stock of attributes in the context of products. But I need stock only by attributes (or by attribute in the context of category).

Anyone facing the same problem? Share the solution please.

Many thanks.

Sounds as though you need to implement some type of calendering system

The only 3rd party one that I have seen is this and I have not used it and it may only be a good starting point for what you need

http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=744

kobra:

Sounds as though you need to implement some type of calendering system
The only 3rd party one that I have seen is this and I have not used it and it may only be a good starting point for what you need
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=744

Thanks, but I think that this is not what I need ...

I think that is need to keep stock of available rooms in the custom DB tables, because the usual attributes of products for this purpose are not suitable...

But then the question - how I can add to the price of the product price of the selected rooms, and their names? I can do it without the use of attributes?

And in which module I need to reduce the number of rooms, if the order was done, and I need to make certain rooms inaccessible (by reducing the number of rooms for specified dates)?

In other words, is it possible to add on-the-fly to shopping cart custom data (name & price), for example:
"2011-03-03-single room", +28$
"2011-04-03-single room", +28$
"2011-04-04-single room", +30$
"2011-04-05-single room", +32$
"2011-04-06-single room", +32$

Exactly the same way if they were the attributes of the product. But not using attributes?...

It is necessary that these data increased the price of the product, and then displayed in the order...

Thanks