Hello Gareth, and first of all thank you for your quick answer:
I am going to try to explain it better.
I have created a clon friem the theme klass following the instructions of a Moodle developer.
I think I've done all the concerning changes in the clone, also in the lib.php etc
In fact it works well and Moodle recognizes correctly the clones, and I can assign each of them to a different category and also customize them independently through the custom CSS field.
As you can see in the enclosed document. (Figures 1 and 2)
When I change both custom css field they apply correctly to each of the themes (the original klass and the clone klass2)
However, when I change the logo (Above the custom css field), although I add a different logo for each theme, in the original theme and in the clone appears the same logo, the one I ve added to the original theme.
I think that when i followed the instruction to clone themes this way, (duplicating the theme and changing all the appropriate fields in the files), it was also indicated that using this methodology all the configurations in the cloned themes should be done though the field "custom CSS".
So, as expected, if I change the logo in the cloned theme Klass2 (figures 3), it does not works, and when i select this cloned theme Klass2 it displays the logh added in the original theme (klass). (figure 4)
That is why I'm asking how I can add the logo for this cloned theme as an instruction in the Custom CSS field instead that using the field markel on figure 3.
I hope You can understand what I mind.
Thank you very much!!