Excel Expert needed to create Parts list generator

Hi, We are looking for a MS Excel expert to help us with to create an user-friendly Excel spreadsheet for our parts list with a Salesperson mode and a Purchaser mode. The database which we need will contain about 6,000 over line items (parts), and we would provide the raw data in softcopy that could be copied and pasted. The Salesperson mode will consist of 4 screens as below: Screen 1- List of maker for selection Screen 2 - List of models for the selected maker which user can click on Screen 3 - List of parts for the selected model which contain the parts details (9 columns). The parts each have a column for user to select. Screen 4 - The selected parts are summarised on the screen and the column with figures are summed up. The Purchaser mode will have the same Screen 1 and 2 as the Salesperson mode, but a different Screen 3 with more columns of information on the parts (11 columns). At the Purchaser mode, the user will be able to amend the database too, thus the Purchaser mod
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