[Invoicing] Need mass upload of SKU to bill a customer

I have 3 pain points when it comes to financio

1. Mass upload function for invoicing. 

Sometimes I bill over 50sku to a customer. It is not productive to enter 1 item by item. I need to have a function where I can upload from a spreadsheet .

2. No multiple pricing for a product. 

I do wholesale and regular retail. I need to have a way where I can differentiate different customer. A retail customer and a reseller/wholesale buyer. currently financio only have 1 tier selling price

3. Mass update of products for inventory management.

Initial setup of products one can mass upload to do the create. There should be a function for users to upload a spreadsheet to update the other other properties of inventory like QTY or even the name or model etc. 

I have over 1k sku. It is a hassle to use Financio without the above functions.