Thank you for your question.
Where a parent is violating the terms of a custody order, the other party may file a Motion for Contempt of Court (also sometimes referred to as an Order to Show Cause).
Essentially, what a Motion for Contempt does is inform the court "Judge, on X date, you entered a custody/visitation order that required Parent A to do ________________ (whatever the order says). Parent A violated the terms of that Order on ___________ (whatever date/dates) by doing ______________ (whatever they did). They are in violation of the original court order, and I would therefore request sanctions."
If a court finds that a parent has willfully violated the terms of the Order, they can impose sanctions, which are left to the judge. It can be something as simple as the judge giving them a lecture and making them pay your attorney fees for having to file the motion, to something much more serious, like jail time, for repeated violations.
For example purposes, here are forms and instructions
for an Order and Motion to Show Cause from Sante Fe, Rio Arriba and Los Alamos Counties. If you live in one of those counties, you can use these official court forms. If you don't - check with your Clerk of Court if you intend to file the Motion and Order yourself - they likely have very similar forms you can use.