Hi blurflame
With Multi-Inventory, the inventories are linked to individual products and are not generic for all of them (as each product can have different stock quantities, prices, etc), that's why there is no way to create the inventories separately.
It's on our plans to add new functionality to create templates that can be applied to products (for the identical parts only, but not sure when this will be available though).
So, if you want to create the inventories for your 3000 products at once, the only way I can suggest is with ATUM Export PRO add-on.
Any update on this? Isn't there any way to specify the inventories of the products from excel sheet in bulk?
Importing an excel sheet (a CSV file) is just what you would do with ATUM Export PRO
Best Regards,
Salva.