Connected dot plot utitlizes dots to represent different values on a graph. The difference is that these dots are connected by lines. It usually has two dimensions on Rows and two similar Measures (dual axis on Columns). Connected dot plot is sometimes called Dumbbell Chart
Move Sub-category to Rows
Move Sales to Columns, choose Dual Axis and synchronize it.
On Marks card of first Sales, select Line.
Drag Order Date to Path on the Line Marks card.
Move Order Date to Filter shelf, select 2016 and 2017 only.
You should now have a Connected Dot Plot that looks like this: