making of the shoe
 
a simple tutorial on box-modeling - page 10
   
   
 
Move those vertices as shown to center them as if they were in the third part of the upper patch of the shoe
 
 
  select this polygon and cut it in two parts
 
   
 

Go on selecting those polygons and cutting them into two parts
 
   
 
1 - 2 - 3 - 4 - 5 - 6 - 7- 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19
 
20 - 21- 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32