Discount only certain sizes and quantities or remove size after sold.

[fixgear]

Hi all. Sorry but I did a search and nothing came up.

Here is my dilemma. 

I am trying to get rid of a WHOLE BUNCH of cycling gear so I want to discount it on my shop. The catch is that I only want to offer discounts on the stuff I have in stock so the discount would be limited to certain sizes and limited quantities and once these sell, I would not want the discount to appear anymore. 

Basically, I want to liquidate the stuff I have but NOT offer discounts on models/sizes I don't have in stock because that would require me to order from our manufacturer and bring YET MORE items in.

So, the buyer visits this page for example...

http://www.fixgear.info/en/long-sleeve-cycling-jerseys-men/728-bones-fixgear-long-sleeve-cycling-jersey.html 

... and if they select size S, the discounted price appears as it does when you set a specific price for that combination BUT when they buy it, the S size disappears and is no longer available to future shoppers. 

So, from what I know about PrestaShop, there is not way to do EXACTLY what i want. 

I looked at...

1- setting up a new catalogue price rule but this feature does not seem to allow for such detailed discounts.

2- going into each individual product and under pricing, setting a new price rule with the discount. It lets me discount certain combinations but NOT only 1, 2, 3, etc... pieces that I may have in stock so once the size S I have is sold for example, the price will remain discounted unless I manually change it FAST before someone else buys another at the discounted price.

Also, I have seen on other shop platforms where if say size S of an item is out of stock, it no longer appears as an option on the product page? Can PrestaShop do this? If so, where do I set that up. That would work although setting the specific price for all models and sizes I have to liquidate would be time consuming, if that's the best I can do I'll take it. 

Anyone have any ideas? 

I don't mind paying for an add on if it is a good one and does what I need.

Thanks! 
jer...

[fixgear]

Anyone? 

[fixgear]

Hello? 

[fixgear]

In case anyone is wondering about this same issue, I got the solution in the Spanish forum here --> 

 Bye,

jeremy...