Do I use a CNAME record or an A record?

I have a site with a vbulletin at the following address:

quebecdiscussion.com/forums

I want to make it so when you type

forums.quebecdiscussion.com

it will bring you to the forum. Should I put a CNAME record for forums in webhostmanager or an A record and then point that A record to the IP Or neither? lol If use the A record pointed to the IP won't it just go to the main site and not the forum?

I have another site setup with forums.montrealracing.com however I made an account on WHM called forums.montrealracing.com to recieve it and I have an A record with the domain registrar only pointing to the IP and this works. I don't want to have to make a new account for every forum though.

 

 

 

 

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