Ross,
There are no sub-forum for BMD linking request.
As these must be linked to a census record, such request should be done in the census sub-forum (1901, 1906, or 1911) to which it is to be linked. If the link is to the 1851/1852 census, then make the request in the "Linking Requests" main forum.
Links can not be done to an Ancestry.com page because in most cases, one must be a paying member to access the page.
One must provide all the required Birth/Marriage/Death information for a link to be done. The Best way is to attach a digitized image of the record/certificate to the request.
I have the feeling that you may request many such links, If that is the case, it would be best if you register to the
linking centre and , sign-in, and do the links yourself.
If you have any question on how to do such a link, or what to input in a particulart field, please do not hesitate to ask.
Cheers,