Formatting - Line break between consecutive columns.

[jonmichael]

Can not figure out to show the white space between "Low" "Mid" and "High" columns.

 

[6StringJazzer]

You want to show a small break in the border as in your picture? The only way I know how to do this is to insert columns in between.

And I hope your first line is Center Across Selection and not Merged.

 

[Sergius]

Is this what you wanted?

If yes, then play with the appearance of the borders.

 

[6StringJazzer]

Here's another idea. Add vertical thick white borders on the cells below and they will cause a small break in the horizontal borders.