Dual express entry profile

[Rapri]

1. Can we create two profiles using two different GCKEY?
1st profile-Husband as principal applicant including spouse as dependent and
2nd profile-Spouse as principal including husband as dependent?

2. while creating the 2nd profile, it ask HAVE YOU APPLIED EARLIER FOR EXPRESS ENTRY?
-should i select yes or no?

3. If i select yes for above, its ask to provide UNIQUE CLIENT IDENTIFIER (UCI) of main applicant.
-- should i provide the UCI no alloted when I created the 1st profile (UCI assigned as dependent)

thanks you for your help!