I am trying to create a mailing list, or lists, from an excel file which contains over 1,000 emails. since its impractical to cut and past individually, is there a way i can import/convert the CSV ...

Use Excel’s “Get Data from Folder” feature to import and combine multiple trial balance files into a single query. Clean and transform data using Power Query to prepare it for analysis.

Cleaning Excel Datasets with Power Query Key Takeaways : Import your dataset into Excel via the Data tab, selecting the option to import from a text or CSV file.