mass variant items add to purchase/sales lines

[bunhin]

Hi all,
need for support to be able add all variant into purchase or sales lines or receiving lines automatically with defined certain quantity composition (in a dozen for example) and total quantity off all variants to be purchased to calculate qty for each variants.

for example the product template is clothing or t-shirt, have 6 sizes as variant attribute value eg size XS, S, M, L, XL, XXL. The product should be packed in a dozen pack with composition such as :
1 unit for size XS,
2 units for Size S,
3 units for size M
3 units for size L
2 units for size XL
1 units for size XXL

During purchase order or sales order creation is wanted to add all for variants item into order lines by select the product template, select the wanted "defined size pack composition" or "cretae size pack composition" in the fly and input wanted total qty.

for example with above sample, we want to purchase 1500 pcs (125 dozens) of the t shirt with above size pack composition, when the save button clicked the order lines created as below:

T-shirt-size XS qty = 125 pcs
T-shirt-size XS qty = 250 pcs
T-shirt-size XS qty = 375 pcs
T-shirt-size XS qty = 375 pcs
T-shirt-size XS qty = 250 pcs
T-shirt-size XS qty = 125 pcs
Total = 1500 pcs

I have seen the follwong module
purchase_product_variants
sales_product_variants
may be can be extended with above required feature as an options when it is wanted (auto generate with size pack composition)

have small project required this feature, and i will share contribution from the fee although it is a small fee project only.

I am sorry if this is not the right place to ask for help, please just info the right one.
Thank you
Bun