Summing lines in a dimension to create a P&L

[#1]

I have attached an example of some profit and loss data.

I want to add sales and cost of sales to give gross margin

then gross margin added to overheads to give profit before tax

then profit before tax to taxation to give profit after tax so that i get a profit and loss account as follows

Sales

Cost of Sales

Gross Margin

Overheads

Profit before Tax

Tax

Profit after tax

Any ideas?

Thank you

[#2]

Reload the data to get the costs as negative numbers

[#3]

I think I am nearly there with this new example but not quite. Any idea why the sums are not working for each type?