How to add columns to wordpress menu editor

You can do that with default WordPress menu system and CSS.

When you add item to your menu, Make this hierarchy:

- Services
     - Social Welfare
        |- Funeral Service
        |- Food Bank

Then go with CSS

ul.menu > li > ul > li { /* the CSS for column */
    /* You can use combination of float: left; and width: 20% to get 5 column. */
} 
ul.menu > li > ul > li li {} /* the CSS for items inside column */