Can I possible to have multi price or different price for one inventory item?
I can see this as being a worthwhile addition for those who have more than one level of customer (and therefore more than one pricing tier).
Each inventory (or non-inventory) item can have multiple sell prices, whilst each customer can have a field for “price group” - which matches against which price is used from the item record.
You cannot do that. It has been discussed many times before.
I agree, is it valuable @lubos ? Because the trading company has level in recognizing customers.