how do I send email from subdomain using primary domain identity?

how do I send email from subdomain using primary domain identity?

hi, just curious.

I already have a no-reply[at]example[dot]com for my default outgoing-only.

can I send an email from any-of-subdomain[dot]example[dot]com using these outgoing credentials?

the configuration done properly too in the admin panel, such us DKIM, NS, etc, etc.

thanks.