Move shared 'Users' folder in external disk USB

Hi Apple support, user,

I have a Time Capsule with 3TB and a Western Digital 2TB connected in USB, I actived the share disk with account but I want to change the folder /Users in my extern drive (not in my internal drive)

I want to have the "Shared" folder in internal drive but "User" in my USB drive connected in my TimeCapsule.

Can you say me how to do this change ? I have already do/"able" this by chance but after restore of my TC I don't find how remake it.

Best regards.

Quentin