I have date ordered, grouped weekly, on the x axis and a running total showing number of items ordered on the y axis. This running total accumulates every week so we can see total number of items ordered weekly. Items can be ordered in advance for delivery in forthcoming weeks so data for the year includes weekly advance orders. I have successfully shown the target for the year as a vertical line on the y axis

but

I also need to show a horizontal line on the graph for the current week so we can quickly see what is orders taken and dispatched and what is advance orders but I cannot figure out how to get this current week on the graph. Does anyone know how to do this?