Here is a small tutorial to create Boot using Boundary Blend command !!!!!!!!
Create multiple sketches/loops on different planes
Sketch a Path passing through all loops.
You can give as many path as you want. I have considered 4 paths.
Please note, all paths MUST intersect / PASS through all loops created in step 1.
Click on Boundary Blend.
Choose all 'PATHS' as first direction in sequence. C
Click Close Blend to create continues blend
Choose all 'LOOPS' as second direction in sequence.
You can also make the part using LOOPS as first direction & Paths as second!!!!