Comparing to the index

Try the "Price" indicator. Select it from the drop downs in the Indicator section of the Chart Workbench.

You can place one chart below the other (in the Position box, select "Below), or you can overlay them (select "Behind Price".

Or, you can show the relative strength of one versus the other as a single line using the ratio symbol in the Price or Price-Performance indicator, e.g. HCA:$SPX. Here's and explanation of "price relative" or plotting a ratio for two symbols

https://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:price_relative

You could also use a PerfChart, explained here:

https://stockcharts.com/docs/doku.php?id=other-tools:perfcharts

If you are new, here's a great introduction to using indicators in general:

https://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:introduction_to_technical_indicators_and_oscillators