You can create your own metrics. On the dashboard, in the top-right corner, go to Sections and you'll find Custom metrics.
There you can build your own formula by combining the available metrics, for example to get to a number you track in your spreadsheet that doesn't exist as-is on the dashboard.
Comparison chart
There's also a chart that lets you plot two metrics at once over the selected period —for example profit and profit margin— so you have a day-by-day visual reference.
One detail when building them: formulas are built on the dashboard's metrics, so it's best to always start from those and not from another custom metric.