Melt the margarine ,stir in the sugar and remove from heat.
Add pretzels,mix and save 3/4 c. of the mixture for the top. Put the rest of the pretzel mixture in the bottom of a 9x13 pan.
Beat the cream cheese,confectioners sugar,and vanilla till fluffy. Fold in the cool whip then spread half the mixture ontop of he pretzels in your pan. top with the pie fillingand add remaining half of cream cheese mixture on top of the cherry pie filling. Top with thr reserved 3/4 c.of pretzel mixture.
chill 3 ta 4 hours and serve...You could use your favorite pie filling in place of the cherry pie filling.