In Excell, you can highlight several columns and there is an option to "Merge Across" where it will merge each row individually for the entire column. I'm working with a list of items that includes some html tags that InDesign treated as tabs, so it turned them into extra columns. In order to get them back to what they should be, I'm forced to merge each row individually, whereas this feature would allow me to highlight the original and extra columns and merge them all at once, keeping them in each of their rows.