It sounds like you're looking to use Excel's Grouping feature to roll up columns or rows for summary purposes. Here's how you can do it:

1. Select the columns or rows that you want to group together.
2. Right-click on the selection and choose "Group" from the context menu.
3. A dialog box will appear asking you whether you want to group by rows or columns. Choose the appropriate option.
4. You'll notice that a small + or - sign has appeared next to the grouped columns or rows. Clicking on the + sign will expand the group to show the individual columns or rows, while clicking on the - sign will collapse the group to show only the summary information.
5. To ungroup the columns or rows, simply select the grouped columns or rows and choose "Ungroup" from the context menu.

That's it! You can use this feature to create multiple levels of detail in your worksheets, and easily roll up columns or rows for summary purposes.