You have not included the file in your project description, but for what you say, you may not be arranging the data in the most apropiated way. If you need 255 shets, there is definetily something wrong in you data structure.
Bid to be confirmed when spreadsheet is shared with freelancer.
MS Office / MS Excel advanced expert. 30 years experience in MS Excel and VBA programming. Web scraping, office automation, management dashboards, data mining and analysis, Montecarlo simulation, discrete event simulation, Excel Solver, genetic algorithms, neural networks and other advanced models.