I am not 100% sure about the structure, but after having a quick look I understand the following:
You have an RSS feed that imports newsletters
You have a content type called Newsletter which imports the newsletters from the feed. One of the fields imported is the CDS link. I guess the content type field that holds the CDS link is the field_listing_cds, right?
If yes, then all you have to do is what the following GIFs shows (+ remove the Link from the body of the accordion):
Your understanding is mostly correct, however I don’t understand what you mean that "the content type field that holds the CDS link is the field_listing_cds". I have created a mapping as in the image attached, how do I do what you suggest to map the CDS link to this field?
I had a closer look and now its more clear. So here is the deal:
The CDS link of the newsletter is already imported in a field called Link. However as you can see in the screenshot below, the link is already imported and has as text the name of the newsletter.
The More Link comes from the Body field that is trimmed and displays a “More” link after trimming. You can find how to remove the More Link in the following GIF
The text of the CDS link is imported directly from the feed. If you want to change this text let me know in order to find a solution because currently the feed items are not editable.
This is the solution I got as well, which is an okay solution. A nicer solution would be to be able to use the URL imported from the CDS entry for the “More” link. If it is not possible, I will use the solution you describe above.