You offer a fixed price then talk about ongoing "work for several months to revise and maintain your spreadsheet/database"?
I can produce what you want, but each element will be based on an hourly rate of $28 per hour.
Would normally provide samples to let you judge my skill for yourself, but as you made this a "restricted" project I can't send an attachment unless you send me a Private Message first.
I designed dashboards, reports and spreadsheets and managed databases for twenty years at a leading multinational. Now work from home in the UK across five freelance sites, have completed several similar assignments, and have good reviews from international clients who have utilised my expertise in VBA Coding, Formulae and Conditional Formatting.
Happy to work under a Confidentiality and Non-Disclosure Agreement if required, and will start as soon as you pay the Milestone into the site and send me your existing material.
Hope you find this of interest and look forward to hearing from you
Bob Allen-Turl