Same scenario for me, but with the overhead that we have 3 companies, 2 warehouses, 2 shops and several thousands products, and many of them are "kits".

I'm slowly understanding how everything works and how is glued together. I'm using several different resources. Here are some, but for sure you have checked them already:

• Book online from OpenERP: the link points to the chapter Managing Physical Inventory Structure as starting from here I've managed to understand some of the processes
• The old OpenERP forum: digging through old answers and doing some searches I've found some useful information
• This other site is basically the same as the book online but with some minor changes
• And last but not least, playing around with all the available settings and configurations

The main problem I'm struggling with right now is that there is no up to date documentation for OpenERP v7.0 so I spend lot of time just finding the option I need to click and ensuring that I'm on the correct place.

EDIT

I'm editing to add a comment where I explain what, I believe, is one of the main configurations to take care about when settling up new locations, the Chained Locations and their chaining type.

On the first link I provided is well explained how to automatically move your articles between locations, based on how you configure them. You can have a location for each of your suppliers, one for the customers, others for your shops and off course, the warehouse. You can on location form manage the Chained Locations setup and the chaining type. These options will allow you, for example, when you create a purchase order from a supplier and receive the order, to automatically add those new products to the inventory (your stock location).

The most straightforward way seems to be to still import it with the products by using the quantity on hand field. (Importing is enabled in the general settings, and found on top as a link in e.g. the list of products) It will generate a lot of inventories, but it should work this way.

Of course, I can certainly advise you the OpenERP Book about Logistics for this.