If you need to customize materials via CNC machining but don't have a lot of experience with this form of fabrication, you can always let a professional machinist take over. Your decision to work with said professional will help in multiple ways.
Received Ample Formal Training
Regardless of what you're looking to create through CNC machining, it takes a lot of formal training to have success. You may not be able to go through it yourself because of time or money constraints.
If you have an upcoming project that requires the fabrication of metal, you may have realized that neither you nor your employees have any experience with welding. However, you may still be tempted to have someone at your workplace attempt it because you feel that it cannot be that hard to do after watching a few tutorials.
However, there is a lot more to welding than simply melting a couple of pieces of metal together.