Can I create a custom symbol?

I would like to use a Perf Chart to compare S&P 500 EPS & Real Sales Growth with the S&P 500. So I need the ability to create custom symbols with symbol name, date (year only) and price (EPS or Real Sales Growth). I asked Support once, no reply in over a week so I ask again today (I'm a newish subscriber but long time user; my experiences with Support over the years is: they don't answer, never answered even 1 of my inquiries).