We've got Excel files that contain a column with 13-number long article numbers. The rows are grouped by the first nine of these numbers. What we want is that after each such group, one summary line and one empty line should be added.
Also, the macro must work on Excel for Mac.
## Deliverables
The Excel file, an example file is attached, contains 7 columns. The important ones for the project are "Artikelnr" and "Ursprungligt antal". Artikelnr is the article number column, and "Ursprungligt antal" is the column that should be summarized. There can be empty columns, and columns with other data in them as well in the files. These should be disregarded.