COPA is a partner with Marriott.
How do I transfer COPA miles to Marriott points?
Only United Miles transfer 1:1 for Marriott Points. You could try transffering COPA to United, then transfer from United to Marriott. I don't know of any other way. The partnership between COPA and Marriott is at the following link and is only for Marriott expenses qualifying for COPA miles: Airline Miles Program | Earn Miles with Marriott Rewards This explains how things work.
Retrieving data ...