Clamp on edges

Hi all:

I usually use CATIA V5 to make some simulations of structure, now I used Linear structural validation to make some structure simulation. My question is I could define a clamp on edges at CATIA V5, but I couldn't make the same definition at 3DExperience On-Cloud.

How could I make the same definition at 3DExperience OC as CATIA V5? Change App? or some other operation ?

Thanks for your reply!