Linking Custom Properties (Radio Buttons)

Hi,

I made a custom property that is a radio button set, it basically has the following options, for the "Stage of project" part,

- R&D

- Prototype

- Production

I can choose them and everything is fine in the custom-property tab, however I dont know how to link this information in the Drawing format. I know other properties can be linked using

\$PRPSHEET:"THINGTOLINK" but I dont know how to link to a radio button set (I mean i would assume it would require some sort of IF structure?) Please see picture:

Top has the property tab

bottom has my current drawing template with 3 checkboxes which are never checked because I dont know how to do this.

Thank you!

SolidworksDrawings And Detailing