I see there is support for configure a certificate authority in CertifyTheWeb software under the Settings module but seems to me like it’s set globally and I wouldn’t be able to support multiple domains with each being a separate account but the same Certificate Authority.
Example:
I have two separate domains, 1)foo.com & 2) example.com, with each being under their own separate Sectigo Accounts.
When using the built in Certificate Authorities list no, but if you add your own custom Certificate Authority (e.g.Sectigo CA - Account ABCD) you can then add an ACME account against that CA, then select that CA under Certificate > Advanced > Certificate Authority.
To add a new CA you just need to define the title and ACME directory URL and whether or not EAB is required, you can then add a new ACME account against that CA to use it.