Setting up an A record DNS

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Hi, I just inserted an A record for a subdomain of my site...

I inserted  "book" and an IP that is external to shopify. 

I.e.  book.(mydomain).com  not points to an external IP address.

The DNS resolve is not yet working... I'm not at all sure if I'm allowed to point an A record subdomain to an external IP address hosted elsewhere.  Does anyone know if this should, will eventually work after some delay?   I got no errors inserting the record in the interface.