Edward,
I am running Photo Mechanic 4.6.8 on Mac OS 10.6.8 on an intel Macbook Pro.
I know the PM supports appending information in the Caption, Caption Writers and Keywords field, but I have a situation where I don't want to erase the data already in the Copyright URL field, but I want to append metadata from another field (using a variable, I suppose) and separate the two strings with a comma. Is there a way to do this so that I don't lose information?
You could try the following in your IPTC Stationery Pad's Copyright field:
{copyright}, {other field variable}
Apply it to a single photo and see how it does. If it works for you then you're good to go.
-Kirk