Getting virtual columns to display on graph

Hi All

Having a bit of a puzzle where my virtual columns don’t display as I would hope. I created two of them as below


one saying previous day/ the other saying current day to sum up the different amounts.

When then I put in a slice like this:

and then make a graph like this:

so even though its on a slice which doesn’t include the description column, it still returns it as a value and separates them, but I just want to compare the two numbers against each other in a graph, not have It broken down as is currently happening, is this possible?