How do you combine witchcraft, with your Catholic faith, Carlita??
For some reason I didn't get your question/alert. I used to practice Catholicism a year ago. I stopped going to Mass unless I'm paying respect to my Christian relatives who have passed and big Christian holidays in respect for Christ and the Church.
I don't hate the practice. I love the Church deeply; but, some doctrines in the Christian faith we disagree on.
Witchcraft, well, the modern use of the term, to me is a default to all faiths. Being involved in the unknown to manifest or manipulate the known. For example, prayer is involving the unknown (talking out loud or in person) to manifest or manipulate the known (ask for blessings or give blessings to influence the known).
I don't see it as "having correspondences for spells; saying chants; etc..." so when I have an alter, I pray to my family, do things that any person of any religion would do to associate him/herself with their Divine, God, or Ancestors.
Witchcraft today doesn't reflect that of the past. The past, witchcraft was a polytheistic faith. Now, people can be atheist and witches at the same time.
Short answer: I don't.