Sub Keywords allow you to setup custom responses for additional words following your Keyword. They work in the format 'Keyword' 'SubKeyword' separated by a single space.
Setting up Sub Keywords is simple once you've already setup a Keyword. Click the Plus symbol to expand the Sub Keywords list and then click Add Sub Keyword to create a new Sub Keyword. If you ever want to edit or delete a Sub Keyword all you have to do is click the Plus symbol to reveal your list of Sub Keywords.
Click here to see a working example of a Sub Keyword.