I may have misunderstood your statement. Being a non-religious person, I always looked at the Vatican as being the de facto head of the Catholic Church and custodian of doctrine and canon. I always thought the CBCP would not deviate from these and is answerable to the Vatican, hence, I concluded that CBCP lobbying in the Philippines equates to that of the Vatican.
the way the heirarcy is setup is that it is not a centralized governing body where the Pope micromanages everything. with the Church being present in most countries in the world, it would be impossible to do so. the Church hierarchy would be more or less like the government of Canada (the US by comparisson is still more centralized than Canada). each province in Canada is independent of each other, each with its own laws, each with its own government. taxation and government services are handled by each province separately although some are handled on a national level, most still lies with each province.
now, with the Vatican, yes there is a central belief and the Vatican handles this. being One Church, all bishops must be in communion with the bishop of Rome, or more popularly known as the Pope. which means dogmatic teachings are uniform across the entire Church. but, each bishop has independent rule of their respective territories. meaning they can impose their own rules and regulations that are not covered by doctrines and are not in violation of any doctrines
for example, in Canada the only holidays of obligation besides sundays are Christmas and New Year. in the Philippines, it includes December 8 as a holiday of obligation
other varyinig practices are the use of altar girls (instead of exclusively boys) which again the local archbishop may decide for or against.
technically, each archbishop may enact a rule independent of another bishop. so some practices can be different in the Archiocese of Manila compared to Cubao. but most countries like the Philippines would have a national body of bishops such as the CBCP so as that policy can be uniform throught the country
the CBCP would not deviate from the doctrinal teachings of the Church. but they don't have to have the permission of the Vatican, or orders from the Vatican for them to act on something they feel they need to do. when Cardinal Sin decided to rally the people against Marcos, its his decision, not the Vaticans. i'm not sure but they may also be notifying the Vatican of such actions so that the Vatican can evaluate and see if they are violating any church doctrine. but in most cases they are independent in their decisions or actions
There should be some form of documentation regarding their scope and size. There is a financial aspect to this, as we all know. There seems to be nothing but purely anecdotal evidence out there.
the bigger charities like Caritas would have, but the smaller ones may or may not. but you can count that its presence is wide reaching, as every locale that has a church would definitely have a local charity attached to it, and even in far flung areas you will see missionaries bringing food and medicine to people
with or without any hard data, its a fact that the number of charities is dominated by religious based charities, and the biggest of these religions is the Catholic Church
