quantity groups

[nocomment17]

Hi guys I recently installed P. and was not able to handle the following problem:

I of the products that must be sold in grams and others in liters but only in certain packets, for example:

10 grams

100 grams

300 grams

700 grams

1,000 grams

 

The amount that I will have available in stock for example is 30.000 grams.

I have to give the possibility to buy also the amount of certain packets.

for example:

10 x 100 grams

2 x 1,000 grams

 

so if I made ​​that order is in stock I will have:

30,000 - (10 * 100) - (2 * 1,000) = 27,000

 

Is there a way to handle it or some module to install?

I have found only half of the solution through quantity discounts or combinations thereof, but both have problems and solutions are not feasible.

 

Thanks in advance.