google docs / skript drop down function simple

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

Project Description:
i need a simple drop down in google docs for tables.
with add function

see attachement

row is clicked show all articles from a reference table.
clicking on orange header line:


article quantity price and total
all data is stored in reference table
quantity should be default 1

clicking again into orane line adds another article in the next line.

i need instruction or i think its no possible without a script to plese code me a script.

Skills required:
Android, Google App Engine, Google Chrome, Google Web Toolkit
Additional Files: drop_down.gif
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