For a a nice presentation stream caramel and chocolate on plate and then place your slice of pie.

Freeze pie crust, Heath bits and chips. When Heath bits and chips are frozen chop in food processor until fine. Put pieces back in freezer.

Soften ice cream just until its workable (so bits can be stirred into ice-cream with out melting ice cream. Place lightly thawed ice cream in a chilled mixing bowl and add heath bits and chocolate chips that have been processed. Stir and mix well. Place ice cream in frozen pie shell and refreeze.
When pie has been in freezer for several hours and frozen well you are ready for the next step.

Melt slightly 1/3 cup of the chocolate fudge topping so that it may stream when poured from a measure cup or spoon. The Caramel may stream with out heating, if not you should do the same as the chocolate topping.
Remove the pie from freezer and stream chocolate and Caramel sauce on top of the pie and place back in freezer.
When completely frozen cover tightly and will keep in freezer for several days.