I have an Excel spreadsheet with 1 column, 700 rows. I care about every seventh line. I don\'t want to have to go in and delete the 6 rows between each row I care about. So
Add new column and fill it with ascending numbers. Then filter by ([column] mod 7 = 0) or something like that (don't have Excel in front of me to actually try this);
If you can't filter by formula, add one more column and use the formula =MOD([column; 7]) in it then filter zeros and you'll get all seventh rows.