Hello,
Since my graduation in 2015 as an engineer IT , I work as business analyst , i have elaborated several documentation and analysis using unified method especially UML, BPM... and i already modeled more than 100 business processes and UML diagrams with PowerAMC, Visio, Bizagi Modeler....providing catchy and professional works.
I have an interesting experience in Modeling and interpretation of database /datawarehouse, we can elaborate high quality documentation of requirement containing the most important diagrams like uses case, class diagrams, activity diagrams, seqences...So i can transform your excel sheet to a database which can query and figure out all calculations and clients preferences because the main solution is to to separate the whole excel into tables having relations between them via Identifiants, then we can populate this database with your current data and enjoy the results.
Feel free please and contact , i assure that i can satisfy you completely and want to have a long term collaboration with you and i will be glad to offer you my services, i will send you samples of my closed work and we can negotiate everything you want.
Best Regards