Magento import scritp for simple/configurable + qty

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
We need a script/procedure to be able to:

1. Import and link simple and configurable products in Magento. We only care for one attribute, product Size.

2. The script/procedure must provide the possibility to increase quantities, if product already exists on the system.

We have two CSV files to import, one for simple and one for configurable products. We can provide sample files if required.

Vers. Magento

P.S. Please advice if newer magento versions offer more features on this issue.

Skills required:
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