Hi Chris,

this is how you can do it.

First, in the Column Display settings, add any custom CSS class name you wish,

for this example let's say we just call it "boldfont".

Then, add this CSS to your Customize/Custom CSS of this table :

td.boldfont {
    font-weight : bold !important;
}

Now any column in this table that gets the class "boldfont" is going to have this style applied to it.

If you wish to make a "global Css" which will be applied for all tables  ( any table that has this class),

you can add this CSS code to main plugin settings/Custom JS and CSS/Custom CSS.

Let me know if that helps.