i WANT TO WRITE SOME NOTE/TEXT WHICH SHOULD NOT GET PRINTED WHEN I PRINT

SOMETIME I DONT WANT SOME TEXT OR SOMTHING(DISCRIPTION/PART NUMBER/COUSTERMER NAME ETC)TO BE PRINTED BUT THAT IS REQUIRED TO ME ONLY.HOW DO I DO IT?
SOMETIME I DONT WANT SOME TEXT OR SOMTHING(DISCRIPTION/PART NUMBER/COUSTERMER NAME ETC)TO BE PRINTED BUT THAT IS REQUIRED TO ME ONLY.HOW DO I DO IT?