How do I setup all subdomains *.domain.tld to point to a domain domain.tld? | wildcard dns in plesk

For that purpose you should add an entry into domain’s zone DNS  like:

*.domain.com. CNAME domain.com.

and configure Apache with the following line in the domain’s vhost.conf:

ServerAlias *.domain.com

After the changes have been made do not forget to restart apache (with
“$PRODUCT_ROOT_D/admin/bin/websrvmng -a -v”) and BIND services to
apply changes.