Modify Excel spreadsheet to add an extra feature for Importing and procesing 2 csv files - Repost - open to bidding

Currently we have an Excel file which imports a single csv file which is processed and generates several graphics and shows some data. The new functionality that is needed is to import two similar files and make a simple subtraction between the temperature data to generate a graph with both temperatures with a gradient temperature. All the requirements and the expected output are included in the excel file (instructions in spanish) Plantilla Reporte Hormigon Masivo .xlsm three excel files are attached with manual process as an example GRADIENT TEMP COLADA 1 3 4 Two csv data files are also attached, which are the ones that must be processed to generate the output graph and the necessary calculations. It is desirable that the format and distribution of data in the archive can be improved. Development is required in the latest Office 365 version of Excel.