I divided up my spreadsheet info sections by creating a pivot table and then double clicking on each subgroup to make tabs for each subgroup info. Then I copied and pasted the subgroups (with edits) back together into one new spreadsheet.
Now, however there is a dark line between the sections in the new ss and the document won't sort as a whole.
So what are those dark lines and how do I get rid of them?

Thanks,
Confused