"...If I copy the spreadsheet with the list to another workbook I have to re-create the list..."
This depends on how you copy the data to the other file.
Instead of copying and pasting use the copy of the worksheet by another method:
Follow this link from the official Microsoft website and choose:
Move or copy worksheets to a different workbook
Remember to maintain both workbooks open while this operation.
It works completely.
"...if I edit (insert rows for examble) my datasheet again the drop down list goes wrong..."
This is because when you created the named range it gets with the limits locked.
So when you increase the rows the named range does not change automatically.
Suppose you created the named range in column A of sheet2 of the workbook:Test1.xlsx Use this formula:
This formula allows you to add new rows without having to change the named range. It always works.
When you copy this tab from the Test1.xlsx workbook to another workbook, for example:Test2.xlsx, the named ranges will go together without any problem.
Please tell us if all of these instructions have resolved your question.
I hope I have helped.
Belo Horizonte, Brasil.