Different selling price list per each inventory item

Hello Gents, I need help please to identify different selling prices per each inventory item to formulate like a selling price list from where the selling price is automatically filled according to customer code is entered at an invoice cause actually we have different clients category / tiers i.e, whole sellers , retailers and cash clients

Second : What is the costing method applied for inventory module … FiFO or WA , can I choose among them

Many thanks in advance for your guide

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