How sell the products with different attributes ?

Hello,

I m building a website based on Zen Cart which is a wonderful software but I still have a big problem :

My Shop is selling clothes by package of 100 or 200...(no individual) And I need for the custommer to choose how many small, how wants medium ect... he wants.....

I can't just do attribute with radio button because all the shits will be size S or M, but I need for example, if my custommer wants 100 shirts to select 25 S, 50 M ans 25 L....

If someone coul help me !

thank you very much for your help, sorry for my english, and you can visite my site on https://www.eskimo-communication.com

Idan

The Products have settings for:
Minimum
Maximum
Units

And then a setting for Mixed ON/OFF ...

Mixed ON means with minimum set to 6:
1 Red
3 Green
2 Blue

Mixed OFF means:
6 Red
-or-
6 Green
-or-
6 Blue