How to create merged column headers in Matrix visual?

[ERing]

I would like to create a Matrix visual that looks like below where I have merged column headers (cars, trucks, suv's).

How can I add the merged headers?

[parry2k]

I wish you have explained it upfront. Better to combine (append) these tables  as one table and then use what I suggested in my original reply. 

[parry2k]

@ERing In a matrix visual, whatever the column stores the value "Car/Truck/SUV" will be on the column, in the value section, you will use measures (actual/baseline/data) and the rows will have the location column.

[ERing]

My data for each category (cars, trucks, & suv's) are in different tables. So I have a "cars" table, a "trucks" table, and an "suv" table.

I don't have a column that stores "car, truck, suv" values.

[danextian]

Do those tables share the same structure? If they do, it would be better to combine them into a single table with an additional column to indicate the vehicle type. You can use the append feature in the query editor.