Creating excel files how much to charge

yes a create a set of excel files for the company, is a large company, is being use in 130 different units they have use the files fthat I create for 4 years, never were paid and is time for me to get paid but how much do I charge or how do i get the value of all my work I create tem, give seminar on how to use them, updated them and teach people how to use them
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  1. You need an attorney that knows intellectual property laws.
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