How do you make columns without making a new column in the top row in Open Office?

I am using the table function in Open Office and trying to have a description on the top row and then break down the information into different columns below it. When I try to do this it creates a new column in the top row as well, which is not something I want to do.

I know I can separate the columns, but then I don’t know how to combine them back again. Anyone know how to do this?