Help with PKI

My questions are about PKI. I have been trying to setup a PKI and now have one setup in a lab. At that time, I did not use a CAPolicy.INF file and everything seems ok.  I just registered and received my PEN number from IANA and it looks like i am supposed to put this in the Policy file before setting up my Subordinate CA. That is fine, as i plan to rebuild one more time in the lab. It looks like I am supposed to enter the PEN/OID number in the form of PEN. then an object identifier for the cert template i want to use.  For example, if i used PEN.  It would cover ALL Cert Templates and i'd only need the one policy?  since my PKI seems to work without even building a custom CAPolicy.inf, i'm not sure why one would benefit me. It seems like it would be less administrative overhead to not even have it.  Also, if I DO need to use my PEN/OID, should I make a policy for any Cert Template i think I may need in the future?
Eric HummelAsked:
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If you want to customize CA installation, then only you need capolicy.inf
 Else with default setup CA can be installed without any issues
AD integrated CA anyways have all templates stored in active directory

If you wanted to publish custom CPS (Certificate Policy Statement), then you may use CAPolicy.inf

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