Again, it's not about "copy-paste".
For an application under the CEC, you need to show that you have performed a majority of the lead duties listed in the NOC. You need to prove this to the satisfaction of the IRCC officer.
You can copy the list, but the letter should have a bit more detail that shows that you actually did the job. Your employer may be contacted by IRCC to verify the letter as well.
If you take the lead duties and write them in the form of several paragraphs, you will naturally paraphrase them while staying close enough to the NOC description.
