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
If your original data is in column form with multiple columns and the first entry of your original data in C42, and you want your new (down-sampled) data to be in column form as well, but only every seventh row, then you will also need to subtract out the row number of the first entry, like so:
=OFFSET(C$42,(ROW(C42)-ROW(C$42))*7,0)