To me, a "Talkaround" is a channel that by-passes a repeater. What I've seen is that they are conventional channels, usually transmitting on low power.
If that's the case, you'd have to program a new conventional system with the appropriate frequency or frequencies used for talkaround purposes.
If we are talking about the same thing, they can also be referred to as Simplex or Scene of Action frequencies. They may be listed separately in the RR or Sentinel databases requiring a little searching. One you locate it/them you'll have to note the Service Type, several different ones could be used, including Multi Tac.