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I made a small tutorial. more hints for similar problems you will finde here..
https://www.youtube.com/watch?v=6X5cP6br99UI you like subscribe, and give a "like it"
greetings
Step 1
use GSD and multisection surface
Step 2
select the vurves
Step 3
replace the closing points
Step 4
look at the orientation of red arrow, complete all 4 sketchs
Step 5
first result
Step 6
use a guide curve for a better result
Step 7
use couplings for even more better result.
Your sample didn´t do that, you can see a bad surface in the middle.
Hello, may I suggest you to have a look to this Crane hook built by me:
HOOK_Catia_Killer_TEST.CATPart,
it has all the history.