Dynamic Horizontal + Vertical chart

Hi,

I need a chart to can be expanded vertically (limited to say 10 rows) and horizontally (no real limit).

Now I don't have a lot of experience with excel. From what I have seen so far is that you give it the range to use (but this gets replaced with a absolute value) then you edit the seriesNames and add a OFFSET formula for the values. The Label range is also a OFFSET formula.

The only way I have found to make the graph expand vertically as well is to add the empty rows below the current ones to the graph as series and a OFFSET for the empty values so when this is populated its added to the graph. EDIT: ok it seems like you can't use a OFFSET formula that has all its fields empty as a values field for a graph.

I would just like to know if there is another/better way to do this.
I have attached a sample excel file (it does not have the empty rows added as series values etc)

testingGraph.xlsx