A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Please explain what you are doing and why so we have a better idea of what is going on and so that we can make more informed suggestions.
Notepad is a very simple text editor. It cannot handle spreadsheets or tables. If you paste from excel, it uses tabs to separate column data.
Does it have to be Notepad? Why?
If it must be Notepad, then you probably should use SAVE AS "CSV" format. That a text only format with commas separating fields (assumes no text fields with commas!).
Do you need to maintain table structure? If you do, then try WordPad.