Best practice for separating email and web is to use the MX record to direct the email. So, you need 2 x A records, and 1 x MX record. I'm going to imagine that your domain is "example.com", in accordance with https://tools.ietf.org/html/rfc2606
The A records for the bare domain ("example.com") and the www subdomain ("www.example.com") should point to the same place. Why? Because it's common practice, and because some people think web sites ALWAYS have www, and others know that's not true, and like to just type the domain that they've remembered.
The MX ("eMail eXchange") record is used by Mail Transport Agents to find out where email belongs. Strictly speaking, they'll use the A record for the domain if there's no MX record, but no serious email domain goes without an MX record these days. So, your domain has an MX record already, if you're using Symbiosis. The MX record is exactly designed to serve your purpose here.
You'll have a DNS file at /srv/example.com/config/dns/example.com.txt and you should edit that file, replacing all the IP addresses in the lines that begin "=example.com" or "=www.example.com" . If the new site supports IPv6, then you'll have been given an IPv6 address. Use that for lines that begin "6example.com" (replace the '6' with a '3', though) and "3www.example.com".
Once you've edited this file, Symbiosis won't touch it again, but it will use it to publish the records that you've created.