Calculate points by platform and line chart

Calculate points by platform and line chart

I'm trying to recreate this chart in Zoho and running into a few problems.
It shows how many points are achieved over a few years and has separate lines for where these points were achieved on App or Web.
In my table I've got separate columns for 
- the year points were achieved, ie 2016
- the amount of points the given row achieved ie 1000
- what platform they were achieved on, ie app or web (A or W)



To get a similar chart to above, I'm thinking I have to create a formula column calculating:
- amount of points achieved pr platform
And then create a chart with points as Y column, year as X column.
Do I also need to create a formula column for each platform combined to get the 'All' line?

How does that sound?
And more specifically, how would I calculate 'the amount of points achieved pr platform'?

Thanks!!

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