How to add and remove table columns
You can add and remove columns in content tables. When you enter the text of a cell and hover a column you'll see a plus button (+) and trash icon above the column. This lets you add a new column or remove it.
You can't add columns to pricing tables. The columns are standardized based on the fee type (eg: fixed, unit/quantity, monthly etc.) in order to work with external invoicing tools and auto calculate correctly.