Creating a Placeholder Field

I'm curious about how placeholder fields are created and where they live in the database. We have an Education customization where one of the custom tables includes a {price} placeholder. This price placeholder is put in the Description column of the custom table along with free text. The text plus the price of the event from the price layer then appears on our add-on page in TNEW.

I'd like to create another placeholder for the TN_Express_Title so that I don't have to always edit/inactive rows in this custom table as we have different add-ons throughout the year that could function in the same way. in case that doesn't make sense, here's an example...

  • Perf 1 (Piano 101) happens on Dec. 5, 2016 and has an add-on called Deluxe Workshop.
  • Perf 2 (Composing for Greatness) happens on Jan. 8, 2017 and has add-ons called Getting Started and Mastering the Metronome.

I'd like to create a placeholder that references the TN_Express_Title for each of those add-on perfs (something like {TN_Express_Title} ({price}) rather than having to code three lines in the custom table - one for Deluxe Workshop ({price}}, one for Getting Started ({price}) and one for Mastering the Metronome ({price}).

Any ideas are greatly appreciated as our customization was delivered with the price placeholder and this is new territory for us. Thanks!