Improving this ecommerce budget model

[mikkelb]

Improving Purchases and Sales sheets

At https://docs.google.com/spreadsheet/ccc?key=0AmY3HgUDDM9kdEs1Tzg0cE92T2x3MEtwX0NrQk9pR2c - how to best restructure the Purchases and Sales sheets (for ecommerce - apparel)? How do the pros do it? I also feel they ought to be more interconnected, but that I've failed to model that somehow.

Thanks in advance!

All the best,
Mikkel