Merge Pivot Table Columns to count as one column

Merge Pivot Table Columns to count as one column

I am new to using Zoho Analytics and I am trying to run some simple pivot tables. 

Basically I need to know how I can merge columns together so I can count them as one. 

We use Deal stages to track a record progress. Some deal stages need to be rolled up into one column. (For example in the screenshot below (Follow up to Demo, Scheduled to Demo = DEMO). 

So I want to display the totals of multiple columns and sum them into one column.