SSL and Multisite expert needed

I have 2 ssl for 2 domains on the same IP.
primary domain: domain1.com , wildcard SSL
add-on domain: domain2.com , SSL

the multisite setup is a sub-domain install.
new.domain1.com needs to be mapped to domain2.com
SNI is enabled (should be correctly enabled)

I would like to know how to domain map an add-on domain correctly, what should the name server, A record, and C Name settings be set to?

We could do this through teamviewer. Please contact me! Thanks!
https://premium.wpmudev.org/jobs/ssl-and-multisite-expert-needed/