creating color curves in Adobe Photoshop

Hello, I am a screenprinter and sometimes I need to print with inks they do not have their own profile.
Entering in 
Edit-Color setting I can assign a CMYK profile, but when I enter in color curve all datas stop working.
Is there someone can help me in creating a .csf file to enter a right color profile in photoshop?
Thank you to anyone could answer me or give me a place where to learn this
Angelo