Sure you can define as tanget. Check the picture below.
Why? if you select tanget options there will be no problem.
Thanks for responding kesebir.
I am designing duct it requires tangency.3 sections are different and these are maintenance smooth radius..40mm inner and 90mm outer ..if it is possible ok.otherwise if you know any other command tell me.
use multi section option in catia. but sweep option has 2 sections & 3 Guide curves.